Britain's Prince William attends an event celebrating Namibia-UK relations in Windhoek, Namibia, September 25, 2018. REUTERS/Mike Hutchings?

Britain's Prince William attends an event celebrating Namibia-UK relations in Windhoek, Namibia, September 25, 2018. REUTERS/Mike Hutchings?

Britain's Prince William attends an event celebrating Namibia-UK relations in Windhoek, Namibia, September 25, 2018. REUTERS/Mike Hutchings?

Britain's Prince William attends an event celebrating Namibia-UK relations in Windhoek, Namibia, September 25, 2018. REUTERS/Mike Hutchings?

Britain's Prince William attends an event celebrating Namibia-UK relations in Windhoek, Namibia, September 25, 2018. REUTERS/Mike Hutchings?

Britain's Prince William attends an event celebrating Namibia-UK relations in Windhoek, Namibia, September 25, 2018. REUTERS/Mike Hutchings?

Britain's Prince William attends an event celebrating Namibia-UK relations in Windhoek, Namibia, September 25, 2018. REUTERS/Mike Hutchings?

Britain's Prince William arrives for his meeting with Namibia's Vice President Nangolo Mbumba in Windhoek, Namibia September 24, 2018. REUTERS/Mike Hutchings?

Britain's Prince William arrives for his meeting with Namibia's Vice President Nangolo Mbumba in Windhoek, Namibia September 24, 2018. REUTERS/Mike Hutchings

Britain's Prince William talks with Namibia's Vice President Nangolo Mbumba during their meeting in Windhoek, Namibia September 24, 2018. REUTERS/Mike Hutchings?

Britain's Prince William presents a gift to Namibia's Vice President Nangolo Mbumba during their meeting in Windhoek, Namibia September 24, 2018. REUTERS/Mike Hutchings?

Britain's Prince William receives a gift from Namibia's Vice President Nangolo Mbumba during their meeting in Windhoek, Namibia September 24, 2018. REUTERS/Mike Hutchings?

Britain's Prince William arrives for his meeting with Namibia's Vice President Nangolo Mbumba in Windhoek, Namibia September 24, 2018. REUTERS/Mike Hutchings

A general view of the city and Christ Church in Windhoek, Namibia, February 24, 2017. REUTERS/Siphiwe Sibeko

People walk past a logo of the Bank of Namibia at the company's headquarters in Windhoek, Namibia, February 24, 2017. REUTERS/Siphiwe Sibeko

A building of the Parliament of the Republic of Namibia is seen in Windhoek, Namibia, February 24, 2017. REUTERS/Siphiwe Sibeko

A logo of the Bank of Namibia is seen at the company's headquarters in Windhoek, Namibia, February 24, 2017. REUTERS/Siphiwe Sibeko

A child carries a chair past an entrance to a makes shift shebeen at a township in Okahandja, Namibia, February 21, 2017. REUTERS/Siphiwe Sibeko

Christ Church is seen in Windhoek, Namibia, February 21, 2017. REUTERS/Siphiwe Sibeko

A logo showing an entrance to the Rio Tinto owned Rossing Uranium Mine in the Namib Desert near Arandis, Namibia, February 23, 2017. REUTERS/Siphiwe Sibeko

A logo of Namibia's Bank of Windhoek is seen above the company's headquarters in the capital Windhoek, Namibia, February 21, 2017. REUTERS/Siphiwe Sibeko

Passengers board a South African Airways the capital aircraft t the Hosea Kutako International Airport, outside Windhoek in Namibia, February 24, 2017. REUTERS/Siphiwe Sibeko

An entrance to the Husab mine, a uranium-only deposit, located in the Namib Desert near Walvis Bay, Namibia, February 23, 2017. REUTERS/Siphiwe Sibeko

A man pushes a wheelbarrow past Namibia's power utility Nampower in Windhoek, Namibia, February 24, 2017. REUTERS/Siphiwe Sibeko

Beers are packed in a fridge at a bar in Windhoek, Namibia, February 23,2017. REUTERS/Siphiwe Sibeko

Passengers walk past an AirNamibia aircraft at the Hosea Kutako International Airport, outside Windhoek in Namibia February 24, 2017. REUTERS/Siphiwe Sibeko

A Herero woman shops at a Shoprite store in Otjinene Village in the Omaheke Region, Namibia February 22, 2017. Picture taken February 22,2017. REUTERS/Siphiwe Sibeko

A Herero woman shops at a Shoprite store in Otjinene Village in the Omaheke Region, Namibia February 22, 2017. Picture taken February 22,2017. REUTERS/Siphiwe Sibeko

Franciska Karuhumba looks on at her home in Okahandja,70 km north of Windhoek, Namibia, February 21, 2017.Picture taken February 21, 2017. REUTERS/Siphiwe Sibeko

Namibian Alex Kaubtauuapela leans on her walking stick at her home in Okahandja, north of Windhoek, Namibia, February 21, 2017. Picture taken February 21, 2017. REUTERS/Siphiwe Sibeko

Sarafina Nbaimbaind looks on during an interview with Reuters at her home in Okahandja, north of Windhoek, Namibia, February 21, 2017. Picture taken February 21, 2017. REUTERS/Siphiwe Sibeko

Namibian Alex Kaubtauuapela leans on her walking stick at her home in Okahandja, north of Windhoek, Namibia, February 21, 2017. Picture taken February 21, 2017. REUTERS/Siphiwe Sibeko

Sarafina Nbaimbaind speaks to Reuters at her home in Okahandja, north of Windhoek, Namibia, February 21, 2017. Picture taken February 21, 2017. REUTERS/Siphiwe Sibeko

Graves are seen at a cemetery where German soldiers are buried, in Okahandja, north of Windhoek, Namibia, February 21, 2017. Picture taken February 21, 2017. REUTERS/Siphiwe Sibeko

The grave of Samuel Maharero, who led the Herero's fight against the German colonial army, is pictured in Okahandja, north of Windhoek, Namibia, February 21, 2017. Picture taken February 21, 2017. REUTERS/Siphiwe Sibeko

Sarafina Nbaimbaind looks on during an interview with Reuters at her home in Okahandja, north of Windhoek, Namibia, February 21, 2017. Picture taken February 21, 2017. REUTERS/Siphiwe Sibeko

Sarafina Nbaimbaind looks on during an interview with Reuters at her home in Okahandja, north of Windhoek, Namibia, February 21, 2017. Picture taken February 21, 2017. REUTERS/Siphiwe Sibeko

Graves are seen at a cemetery where German soldiers are buried, in Okahandja, north of Windhoek, Namibia, February 21, 2017. Picture taken February 21, 2017. REUTERS/Siphiwe Sibeko

FILE PHOTO - Fugitive U.S. millionaire Jacob "Kobi" Alexander sits with his wife Hanna, as he awaits the start of his extradition hearing in Windhoek, September 17, 2008. REUTERS/Stringer/File Photo

Fugitive U.S. millionaire Jacob "Kobi" Alexander sits with his wife Hanna, as he awaits the start of his extradition hearing in Windhoek, September 17, 2008. REUTERS/Stringer /File Photo

Japan's Prime Minister Shinzo Abe(C) leads female ambassadors to Japan to a luncheon at the prime minister's official residence in Tokyo September 10, 2014 after a photo session. Abe invited 14 female ambassadors to Japan to a luncheon held by himself. Seen L-R are South African Ambassador Mohau Nthisana Pheko, Kennedy, El Salvador's Ambassador Martha Lidia Zelayandia, Abe and Indian Ambassador Deepa Gopalan Wadhwa (behind Abe), Minister of Promoting Women's Active Participation and Gender Wquality Haruko Arimura, Uganda's Ambassador Betty Grace Akech-Okullo, Slovenian Ambassador Helena Drnovsek Zorko, Nambia's Ambassador Sophia-Namupa Nangombe and Croatian Ambassador Mira Martinec. REUTERS/Kimimasa Mayama/Pool (JAPAN - Tags: POLITICS)

Japan's Prime Minister Shinzo Abe poses with female ambassadors to Japan and Japanese state ministers during a photo session prior to a luncheon at the prime minister's official residence in Tokyo September 10, 2014. Abe invited 14 female ambassadors to Japan to a luncheon held by himself. Seen L-R are Vice Foreign Minister Yasuhide Nakayama, Bosnia and Herzegovina's Ambassador Anesa Kundurovic, Israeli Ambassador Ruth Kahanoff, Liberia's Ambassador Youngor Telewoda, Tonga's Ambassador Tania Laumanulupe 'o Talafolika Tupou, Tanzanian Ambassador Salome Thaddaus Sijaona, South African Ambassador Mohau Nthisana Pheko, Kennedy, El Salvador's Ambassador Martha Lidia Zelayandia, Abe, Indian Ambassador Deepa Gopalan Wadhwa, Arimura, Uganda's Ambassador Betty Grace Akech-Okullo, Slovenian Ambassador Helena Drnovsek Zorko, Nambia's Ambassador Sophia-Namupa Nangombe, Croatian Ambassador Mira Martinec, Irish Ambassador Anne Barrington and Deputy Chief Cabinet Secretary Katsunobu Kato. REUTERS/Kimimasa Mayama/Pool (JAPAN - Tags: POLITICS)

Japan's Prime Minister Shinzo Abe (C) poses with U.S. Ambassador to Japan Caroline Kennedy (bottom row, 3rd L), Japanese Minister of Promoting Women's Active Participation and Gender Equality Haruko Arimura (bottom row, 3rd R) and other female ambassadors to Japan during a photo session prior to a luncheon at prime minister's official residence in Tokyo September 10, 2014. Abe invited 14 female ambassadors to Japan to a luncheon held by himself. Seen L-R are Israeli Ambassador Ruth Kahanoff, Liberia's Ambassador Youngor Telewoda, Tonga's Ambassador Tania Laumanulupe 'o Talafolika Tupou, Tanzanian Ambassador Salome Thaddaus Sijaona, South African Ambassador Mohau Nthisana Pheko, Kennedy, El Salvador's Ambassador Martha Lidia Zelayandia, Abe, Indian Ambassador Deepa Gopalan Wadhwa, Arimura, Uganda's Ambassador Betty Grace Akech-Okullo, Slovenian Ambassador Helena Drnovsek Zorko, Nambia's Ambassador Sophia-Namupa Nangombe and Croatian Ambassador Mira Martinec. REUTERS/Kimimasa Mayama/Pool (JAPAN - Tags: POLITICS)

People test the temperature of an egg frying in a pan using heat taken from reflected sunlight off the Walkie Talkie tower in central London September 4, 2013. The Walkie Talkie tower that reflects sunlight at an intensity capable of melting parts of a car became the latest attraction in the city's financial district on Tuesday as the developers acted to find a quick fix. REUTERS/Suzanne Plunkett (BRITAIN - Tags: BUSINESS REAL ESTATE ENVIRONMENT)

Pedestrians react to an intense beam of sunlight which was reflected off the Walkie Talkie tower in central London September 4, 2013. The Walkie Talkie tower that reflects sunlight at an intensity capable of melting parts of a car became the latest attraction in the city's financial district on Tuesday as the developers acted to find a quick fix. REUTERS/Suzanne Plunkett (BRITAIN - Tags: BUSINESS REAL ESTATE ENVIRONMENT)

Pedestrians react to an intense beam of sunlight which was reflected off the Walkie Talkie tower in central London September 4, 2013. The Walkie Talkie tower that reflects sunlight at an intensity capable of melting parts of a car became the latest attraction in the city's financial district on Tuesday as the developers acted to find a quick fix. REUTERS/Suzanne Plunkett (BRITAIN - Tags: BUSINESS REAL ESTATE ENVIRONMENT)

A man records a temperature of 54.1 degrees Celsius (129 degrees Fahrenheit) from a thermometer touching the floor after an intense beam of sunlight was reflected off the Walkie Talkie tower in central London September 4, 2013. The Walkie Talkie tower that reflects sunlight at an intensity capable of melting parts of a car became the latest attraction in the city's financial district on Tuesday as the developers acted to find a quick fix. REUTERS/Suzanne Plunkett (BRITAIN - Tags: BUSINESS REAL ESTATE ENVIRONMENT)

Pedestrians pause to feel the heat from an intense beam of sunlight which was reflected off the Walkie Talkie tower in central London September 4, 2013. The Walkie Talkie tower that reflects sunlight at an intensity capable of melting parts of a car became the latest attraction in the city's financial district on Tuesday as the developers acted to find a quick fix. REUTERS/Suzanne Plunkett (BRITAIN - Tags: BUSINESS REAL ESTATE ENVIRONMENT)

Pedestrians take photographs of an egg frying in a pan using heat from the reflected sunlight off the Walkie Talkie tower in central London September 4, 2013. The Walkie Talkie tower that reflects sunlight at an intensity capable of melting parts of a car became the latest attraction in the city's financial district on Tuesday as the developers acted to find a quick fix. REUTERS/Suzanne Plunkett (BRITAIN - Tags: BUSINESS REAL ESTATE ENVIRONMENT)

Pedestrians walk through an intense beam of sunlight which was reflected off the Walkie Talkie tower in central London September 4, 2013. The Walkie Talkie tower that reflects sunlight at an intensity capable of melting parts of a car became the latest attraction in the city's financial district on Tuesday as the developers acted to find a quick fix. REUTERS/Suzanne Plunkett (BRITAIN - Tags: BUSINESS REAL ESTATE ENVIRONMENT)

A woman reacts to the heat on her head from an intense beam of sunlight reflected off the Walkie Talkie tower as she tried to take a photo of an egg frying in a pan in central London September 4, 2013. The Walkie Talkie tower that reflects sunlight at an intensity capable of melting parts of a car became the latest attraction in the city's financial district on Tuesday as the developers acted to find a quick fix. REUTERS/Suzanne Plunkett (BRITAIN - Tags: BUSINESS REAL ESTATE ENVIRONMENT)

Pedestrians gather outside scaffoldings built to protect two shops from an intense beam of sunlight reflected off the Walkie Talkie tower in central London September 4, 2013. The Walkie Talkie tower that reflects sunlight at an intensity capable of melting parts of a car became the latest attraction in the city's financial district on Tuesday as the developers acted to find a quick fix. REUTERS/Suzanne Plunkett (BRITAIN - Tags: BUSINESS REAL ESTATE ENVIRONMENT TPX IMAGES OF THE DAY)

Pedestrians walk through an intense beam of sunlight which was reflected off the Walkie Talkie tower in central London September 4, 2013. The Walkie Talkie tower that reflects sunlight at an intensity capable of melting parts of a car became the latest attraction in the city's financial district on Tuesday as the developers acted to find a quick fix. REUTERS/Suzanne Plunkett (BRITAIN - Tags: BUSINESS REAL ESTATE ENVIRONMENT)

An intense beam of sunlight is reflected off the Walkie Talkie tower, in central London September 4, 2013. The Walkie Talkie tower that reflects sunlight at an intensity capable of melting parts of a car became the latest attraction in the city's financial district on Tuesday as the developers acted to find a quick fix. REUTERS/Suzanne Plunkett (BRITAIN - Tags: BUSINESS REAL ESTATE ENVIRONMENT)

The crews on two Clipper 70 yachts participating in the Clipper Round the World Yacht Race stand on deck as they sail on the Thames in London September 1, 2013. The race, which is comprised largely of amateur sailors, will cover 40,000 miles, visit 6 continents, and take 11 months to complete. REUTERS/Suzanne Plunkett (BRITAIN - Tags: SPORT YACHTING CITYSCAPE)

Photographers take pictures of Max, an Eurasian Eagle-Owl as he perches on a scale next to keeper Helen Crooks during a photocall to publicize the annual measuring of all the animals at the London Zoo, in central London August 21 2013. REUTERS/Suzanne Plunkett (BRITAIN - Tags: SOCIETY ANIMALS ENVIRONMENT MEDIA)

An African bullfrog is weighed on a scale during a photocall to publicize the annual measuring of all the animals at the London Zoo, in central London August 21 2013. REUTERS/Suzanne Plunkett (BRITAIN - Tags: SOCIETY ANIMALS ENVIRONMENT)

A waxy monkey tree frog is weighed in a measuring device during a photocall to publicize the annual measuring of all the animals at the London Zoo, in central London August 21 2013. REUTERS/Suzanne Plunkett (BRITAIN - Tags: SOCIETY ANIMALS ENVIRONMENT)

A waxy monkey tree frog is weighed in a measuring device during a photocall to publicize the annual measuring of all the animals at the London Zoo, in central London August 21, 2013. REUTERS/Suzanne Plunkett (BRITAIN - Tags: SOCIETY ANIMALS ENVIRONMENT TPX IMAGES OF THE DAY)

Copies of the Guardian newspaper are displayed at a news agent in London August 21, 2013. British Prime Minister David Cameron ordered his top civil servant to try to stop revelations flowing from the Guardian newspaper about U.S. and British surveillance programmes, two sources with direct knowledge of the matter said. REUTERS/Suzanne Plunkett (BRITAIN - Tags: MEDIA POLITICS)