People visit the consumer trade fair "Caravan Salon" for caravans, motorhomes and camping, which is one of the first fairs that opens for visitors since the coronavirus disease (COVID-19) outbreak, in Dusseldorf, Germany, September 4, 2020. REUTERS/Thilo Schmuelgen

A logo of German caravan maker Knaus Tabbert is seen on a disinfection station at the consumer trade fair "Caravan Salon" for caravans, motorhomes and camping, which is one of the first fairs that opens for visitors since the coronavirus disease (COVID-19) outbreak, in Dusseldorf, Germany, September 4, 2020. REUTERS/Thilo Schmuelgen

Signs are seen on the floor as people visit the consumer trade fair "Caravan Salon" for caravans, motorhomes and camping, which is one of the first fairs that opens for visitors since the coronavirus disease (COVID-19) outbreak, in Dusseldorf, Germany, September 4, 2020. REUTERS/Thilo Schmuelgen

People visit the consumer trade fair "Caravan Salon" for caravans, motorhomes and camping, which is one of the first fairs that opens for visitors since the coronavirus disease (COVID-19) outbreak, in Dusseldorf, Germany, September 4, 2020. REUTERS/Thilo Schmuelgen

People watch the motorhome "Vario Perfect 1200 Platinum" of German motorhome maker Variomobil at the consumer trade fair "Caravan Salon" for caravans, motorhomes and camping, which is one of the first fairs that opens for visitors since the coronavirus disease (COVID-19) outbreak, in Dusseldorf, Germany, September 4, 2020. REUTERS/Thilo Schmuelgen

Caravans of German caravan maker Knaus Tabbert are seen at the consumer trade fair "Caravan Salon" for caravans, motorhomes and camping, which is one of the first fairs that opens for visitors since the coronavirus disease (COVID-19) outbreak, in Dusseldorf, Germany, September 4, 2020. REUTERS/Thilo Schmuelgen

Vintage caravans are seen at the consumer trade fair "Caravan Salon" for caravans, motorhomes and camping, which is one of the first fairs that opens for visitors since the coronavirus disease (COVID-19) outbreak, in Dusseldorf, Germany, September 4, 2020. REUTERS/Thilo Schmuelgen

People visit the consumer trade fair "Caravan Salon" for caravans, motorhomes and camping, which is one of the first fairs that opens for visitors since the coronavirus disease (COVID-19) outbreak, in Dusseldorf, Germany, September 4, 2020. REUTERS/Thilo Schmuelgen

A dog waits as a man watches a caravan at the consumer trade fair "Caravan Salon" for caravans, motorhomes and camping, which is one of the first fairs that opens for visitors since the coronavirus disease (COVID-19) outbreak, in Dusseldorf, Germany, September 4, 2020. REUTERS/Thilo Schmuelgen

Five-year-old model Henry poses in the motorhome Hobby Optima of German caravan and motorhome maker Hobby Wohnwagenwerk during a media event at the consumer trade fair "Caravan Salon" for caravans, motorhomes and camping, which is one of the first fairs that opens for visitors since the coronavirus disease (COVID-19) outbreak, in Dusseldorf, Germany, September 4, 2020. REUTERS/Thilo Schmuelgen TPX IMAGES OF THE DAY

A logo of German caravan maker Knaus Tabbert is seen at the consumer trade fair "Caravan Salon" for caravans, motorhomes and camping, which is one of the first fairs that opens for visitors since the coronavirus disease (COVID-19) outbreak, in Dusseldorf, Germany, September 4, 2020. REUTERS/Thilo Schmuelgen

Models present the full electric caravan "Cara Cito" of German caravan maker Weinsberg during a media event at the consumer trade fair "Caravan Salon" for caravans, motorhomes and camping, which is one of the first fairs that opens for visitors since the coronavirus disease (COVID-19) outbreak, in Dusseldorf, Germany, September 4, 2020. REUTERS/Thilo Schmuelgen

Models show how to split the interior area into two rooms in the van "First class - two rooms" of motorhome maker Malibu Vans during a media event at the consumer trade fair "Caravan Salon" for caravans, motorhomes and camping, which is one of the first fairs that opens for visitors since the coronavirus disease (COVID-19) outbreak, in Dusseldorf, Germany, September 4, 2020. REUTERS/Thilo Schmuelgen

A logo of German caravan maker Knaus Tabbert is seen on a protective face mask at the consumer trade fair "Caravan Salon" for caravans, motorhomes and camping, which is one of the first fairs that opens for visitors since the coronavirus disease (COVID-19) outbreak, in Dusseldorf, Germany, September 4, 2020. REUTERS/Thilo Schmuelgen

A model presents the full electric caravan "Cara Cito" of German caravan maker Weinsberg during a media event at the consumer trade fair "Caravan Salon" for caravans, motorhomes and camping, which is one of the first fairs that opens for visitors since the coronavirus disease (COVID-19) outbreak, in Dusseldorf, Germany, September 4, 2020. REUTERS/Thilo Schmuelgen

A model poses behind an electric fireplace in a luxury caravan of German caravan maker Fendt during a media event at the consumer trade fair "Caravan Salon" for caravans, motorhomes and camping, which is one of the first fairs that opens for visitors since the coronavirus disease (COVID-19) outbreak, in Dusseldorf, Germany, September 4, 2020. REUTERS/Thilo Schmuelgen

A sign showing a hand desinfection order is seen at the entrance of the consumer trade fair "Caravan Salon" for caravans, motorhomes and camping, which is one of the first fairs that opens for visitors since the coronavirus disease (COVID-19) outbreak, in Dusseldorf, Germany, September 4, 2020. REUTERS/Thilo Schmuelgen

People visit the consumer trade fair "Caravan Salon" for caravans, motorhomes and camping, wich is one of the first fairs that opens for visitors since the coronavirus disease (COVID-19) outbreak, in Dusseldorf, Germany, September 4, 2020. REUTERS/Thilo Schmuelgen

People visit the consumer trade fair "Caravan Salon" for caravans, motorhomes and camping, which is one of the first fairs that opens for visitors since the coronavirus disease (COVID-19) outbreak, in Dusseldorf, Germany, September 4, 2020. REUTERS/Thilo Schmuelgen

Visitors enter the consumer trade fair "Caravan Salon" for caravans, motorhomes and camping, which is one of the first fairs that opens for visitors since the coronavirus disease (COVID-19) outbreak, in Dusseldorf, Germany, September 4, 2020. REUTERS/Thilo Schmuelgen

Visitors queue at the entrance of the consumer trade fair "Caravan Salon" for caravans, motorhomes and camping, which is one of the first fairs that opens for visitors since the coronavirus disease (COVID-19) outbreak, in Dusseldorf, Germany, September 4, 2020. REUTERS/Thilo Schmuelgen

A woman puts make up next to bridal gowns during the Exponoivos wedding fair in Lisbon, Portugal January 6, 2019. REUTERS/Rafael Marchante

Groom suits are displayed during the Exponoivos wedding fair in Lisbon, Portugal January 6, 2019. REUTERS/Rafael Marchante

A model presents a wedding dress during the Exponoivos wedding fair in Lisbon, Portugal January 6, 2019. REUTERS/Rafael Marchante

Groom suits and bridal gowns are displayed during the Exponoivos wedding fair in Lisbon, Portugal January 6, 2019. REUTERS/Rafael Marchante

Wedding rings are displayed during the Exponoivos wedding fair in Lisbon, Portugal January 6, 2019. REUTERS/Rafael Marchante

Bridal gowns are displayed during the Exponoivos wedding fair in Lisbon, Portugal January 6, 2019. REUTERS/Rafael Marchante

A view of Rimco booth, Caterpillar Inc's dealer for Cuba at the 36th Havana International Fair (FIHAV) in Havana, Cuba, October 29, 2018. Picture taken on October 29, 2018. REUTERS/Alexandre Meneghini

People walk past equipment by U.S. firm Caterpillar displayed at the 36th Havana International Fair (FIHAV) in Havana, Cuba, October 29, 2018. Picture taken on October 29, 2018. REUTERS/Alexandre Meneghini

A view of pavilion stalls run by U.S. companies at the 36th Havana International Fair (FIHAV) in Havana, Cuba, October 29, 2018. Picture taken on October 29, 2018. REUTERS/Alexandre Meneghini

Greek Prime Minister Alexis Tsipras speaks during a news conference at the annual International Trade Fair of the city of Thessaloniki, Greece, September 9, 2018. REUTERS/Alexandros Avramidis

Greek Prime Minister Alexis Tsipras speaks during a news conference at the annual International Trade Fair of the city of Thessaloniki, Greece, September 9, 2018. REUTERS/Alexandros Avramidis

Greek Prime Minister Alexis Tsipras speaks during a news conference at the annual International Trade Fair of the city of Thessaloniki, Greece, September 9, 2018. REUTERS/Alexandros Avramidis

Greek Prime Minister Alexis Tsipras arrives for a news conference at the annual International Trade Fair of the city of Thessaloniki, Greece, September 9, 2018. REUTERS/Alexandros Avramidis

Greek Prime Minister Alexis Tsipras speaks during a news conference at the annual International Trade Fair of the city of Thessaloniki, Greece, September 9, 2018. REUTERS/Alexandros Avramidis

Protesters clash with police during a demonstration against the agreement reached by Greece and Macedonia to resolve a dispute over the former Yugoslav republic's name, during the opening of the annual International Trade Fair of Thessaloniki by Greek Prime Minister Alexis Tsipras in Thessaloniki, Greece, September 8, 2018. REUTERS/Alexandros Avramidis TPX IMAGES OF THE DAY

Protesters clash with police during a demonstration against the agreement reached by Greece and Macedonia to resolve a dispute over the former Yugoslav republic's name, during the opening of the annual International Trade Fair of Thessaloniki by Greek Prime Minister Alexis Tsipras in Thessaloniki, Greece, September 8, 2018. REUTERS/Alexandros Avramidis TPX IMAGES OF THE DAY

Protesters clash with police during a demonstration against the agreement reached by Greece and Macedonia to resolve a dispute over the former Yugoslav republic's name, during the opening of the annual International Trade Fair of Thessaloniki by Greek Prime Minister Alexis Tsipras in Thessaloniki, Greece, September 8, 2018. REUTERS/Alexandros Avramidis TPX IMAGES OF THE DAY

Protesters throw stones during a demonstration against the agreement reached by Greece and Macedonia to resolve a dispute over the former Yugoslav republic's name, during the opening of the annual International Trade Fair of Thessaloniki by Greek Prime Minister Alexis Tsipras in Thessaloniki, Greece, September 8, 2018. REUTERS/Alexandros Avramidis

A protester chants slogans during a demonstration against the agreement reached by Greece and Macedonia to resolve a dispute over the former Yugoslav republic's name, during the opening of the annual International Trade Fair of Thessaloniki by Greek Prime Minister Alexis Tsipras in Thessaloniki, Greece, September 8, 2018. REUTERS/Alexandros Avramidis

Protesters throw stones during a demonstration against the agreement reached by Greece and Macedonia to resolve a dispute over the former Yugoslav republic's name, during the opening of the annual International Trade Fair of Thessaloniki by Greek Prime Minister Alexis Tsipras in Thessaloniki, Greece, September 8, 2018. REUTERS/Alexandros Avramidis

Policemen detain a protester during a demonstration against the agreement reached by Greece and Macedonia to resolve a dispute over the former Yugoslav republic's name, during the opening of the annual International Trade Fair of Thessaloniki by Greek Prime Minister Alexis Tsipras in Thessaloniki, Greece, September 8, 2018. REUTERS/Alexandros Avramidis

Greek Prime Minister Alexis Tsipras delivers a speech during the opening of the annual International Trade Fair of Thessaloniki, in Thessaloniki, Greece, September 8, 2018. REUTERS/Costas Baltas

Greek Prime Minister Alexis Tsipras delivers a speech during the opening of the annual International Trade Fair of Thessaloniki, in Thessaloniki, Greece, September 8, 2018. REUTERS/Costas Baltas

A priest takes part in a demonstration against the agreement reached by Greece and Macedonia to resolve a dispute over the former Yugoslav republic's name, during the opening of the annual International Trade Fair of Thessaloniki by Greek Prime Minister Alexis Tsipras in Thessaloniki, Greece, September 8, 2018. REUTERS/Alexandros Avramidis

A priest takes part in a demonstration against the agreement reached by Greece and Macedonia to resolve a dispute over the former Yugoslav republic's name, during the opening of the annual International Trade Fair of Thessaloniki by Greek Prime Minister Alexis Tsipras in Thessaloniki, Greece, September 8, 2018. REUTERS/Alexandros Avramidis

A protester wearing gas mask argues with police at a demonstration against the agreement reached by Greece and Macedonia to resolve a dispute over the former Yugoslav republic's name, during the opening of the annual International Trade Fair of Thessaloniki by Greek Prime Minister Alexis Tsipras in Thessaloniki, Greece, September 8, 2018. REUTERS/Costas Baltas

Greek Prime Minister Alexis Tsipras delivers a speech during the opening of the annual International Trade Fair of Thessaloniki, in Thessaloniki, Greece, September 8, 2018. REUTERS/Costas Baltas

Greek Prime Minister Alexis Tsipras delivers a speech during the opening of the annual International Trade Fair of Thessaloniki, in Thessaloniki, Greece, September 8, 2018. REUTERS/Costas Baltas

Greek Prime Minister Alexis Tsipras delivers a speech during the opening of the annual International Trade Fair of Thessaloniki, in Thessaloniki, Greece, September 8, 2018. REUTERS/Costas Baltas

A priest takes part in a demonstration against the agreement reached by Greece and Macedonia to resolve a dispute over the former Yugoslav republic's name, during the opening of the annual International Trade Fair of Thessaloniki by Greek Prime Minister Alexis Tsipras in Thessaloniki, Greece, September 8, 2018. REUTERS/Alexandros Avramidis

Protesters take part in a demonstration against the agreement reached by Greece and Macedonia to resolve a dispute over the former Yugoslav republic's name, during the opening of the annual International Trade Fair of Thessaloniki by Greek Prime Minister Alexis Tsipras in Thessaloniki, Greece, September 8, 2018. REUTERS/Alexandros Avramidis

Protesters take part in a demonstration against the agreement reached by Greece and Macedonia to resolve a dispute over the former Yugoslav republic's name, during the opening of the annual International Trade Fair of Thessaloniki by Greek Prime Minister Alexis Tsipras in Thessaloniki, Greece, September 8, 2018. REUTERS/Alexandros Avramidis

Protesters take part in a demonstration against the agreement reached by Greece and Macedonia to resolve a dispute over the former Yugoslav republic's name, during the opening of the annual International Trade Fair of Thessaloniki by Greek Prime Minister Alexis Tsipras in Thessaloniki, Greece, September 8, 2018. REUTERS/Alexandros Avramidis

A protester wearing gas mask argues with a policeman at a demonstration against the agreement reached by Greece and Macedonia to resolve a dispute over the former Yugoslav republic's name, during the opening of the annual International Trade Fair of Thessaloniki by Greek Prime Minister Alexis Tsipras in Thessaloniki, Greece, September 8, 2018. REUTERS/Costas Baltas

Policemen stand between tear gas and protesters during a demonstration against the agreement reached by Greece and Macedonia to resolve a dispute over the former Yugoslav republic's name, during the opening of the annual International Trade Fair of Thessaloniki by Greek Prime Minister Alexis Tsipras in Thessaloniki, Greece, September 8, 2018. REUTERS/Alexandros Avramidis

Protesters gesture during a demonstration against the agreement reached by Greece and Macedonia to resolve a dispute over the former Yugoslav republic's name, during the opening of the annual International Trade Fair of Thessaloniki by Greek Prime Minister Alexis Tsipras in Thessaloniki, Greece, September 8, 2018. REUTERS/Alexandros Avramidis

Protesters clash with police at a demonstration against the agreement reached by Greece and Macedonia to resolve a dispute over the former Yugoslav republic's name, during the opening of the annual International Trade Fair of Thessaloniki by Greek Prime Minister Alexis Tsipras in Thessaloniki, Greece, September 8, 2018. REUTERS/Costas Baltas

Protesters clash with police at a demonstration against the agreement reached by Greece and Macedonia to resolve a dispute over the former Yugoslav republic's name, during the opening of the annual International Trade Fair of Thessaloniki by Greek Prime Minister Alexis Tsipras in Thessaloniki, Greece, September 8, 2018. REUTERS/Costas Baltas

A protester argues with police at a demonstration against the agreement reached by Greece and Macedonia to resolve a dispute over the former Yugoslav republic's name, during the opening of the annual International Trade Fair of Thessaloniki by Greek Prime Minister Alexis Tsipras in Thessaloniki, Greece, September 8, 2018. REUTERS/Costas Baltas