Dockers protest at Sant Jaume Square during Catalonia's general strike, in Barcelona, Spain, October 18, 2019. REUTERS/Jon Nazca

Dockers protest at Sant Jaume Square during Catalonia's general strike, in Barcelona, Spain, October 18, 2019. REUTERS/Jon Nazca

Dockers protest at Sant Jaume Square during Catalonia's general strike, in Barcelona, Spain, October 18, 2019. REUTERS/Jon Nazca

Dockers protest at Sant Jaume Square during Catalonia's general strike, in Barcelona, Spain, October 18, 2019. REUTERS/Jon Nazca

People wear local Carnival costumes at a gathering dedicated to workers "la chapelle des dockers", during "Carnaval de Dunkerque" in Dunkirk, France March 4, 2019. REUTERS/Pascal Rossignol

Two revellers execute the "zot'che" , the traditional Carnival kiss at a gathering dedicated to workers "la chapelle des dockers", during "Carnaval de Dunkerque" in Dunkirk, France March 4, 2019. REUTERS/Pascal Rossignol

People wear local Carnival costumes at a gathering dedicated to workers "la chapelle des dockers, during "Carnaval de Dunkerque" in Dunkirk, France March 4, 2019. REUTERS/Pascal Rossignol

People wear local Carnival costumes at a gathering dedicated to workers "la chapelle des dockers, during "Carnaval de Dunkerque" in Dunkirk, France March 4, 2019. REUTERS/Pascal Rossignol

A reveller wears a local Carnival costume at a specific gathering dedicated to workers "la chapelle des dockers ", during the Carnaval de Dunkerque" in Dunkirk, France March 4, 2019. REUTERS/Pascal Rossignol

A reveller wears a local Carnival costume at a specific gathering dedicated to workers "la chapelle des dockers ", during the Carnaval de Dunkerque" in Dunkirk, France March 4, 2019. REUTERS/Pascal Rossignol

A docker climbs the stairs to work in the cabin of a crane at APM Terminals in the port of Algeciras, Spain May 31, 2018. REUTERS/Jon Nazca

French gendarmes take position as part of a demonstration by dockers during the inauguration of the first French offshore floating wind turbine, Floatgen, in the port of Saint-Nazaire, France, October 13, 2017. REUTERS/Stephane Mahe

French riot police take position as part of a demonstration by dockers during the inauguration of the first French offshore floating wind turbine, Floatgen, in the port of Saint-Nazaire, France, October 13, 2017. REUTERS/Stephane Mahe

French riot police take position as part of a demonstration by dockers during the inauguration of the first French offshore floating wind turbine, Floatgen, in the port of Saint-Nazaire, France, October 13, 2017. REUTERS/Stephane Mahe

French dockers attend a demonstration during the inauguration of the first French offshore floating wind turbine, Floatgen, in the port of Saint-Nazaire, France, October 13, 2017. REUTERS/Stephane Mahe

French riot police take position as part of a demonstration by dockers during the inauguration of the first French offshore floating wind turbine, Floatgen, in the port of Saint-Nazaire, France, October 13, 2017. REUTERS/Stephane Mahe

Machinery moves a container after the partial suspension of a nationwide strike of dockers against a planned port reform in line with European Union laws in the port of Valencia, Spain June 21, 2017. REUTERS/Heino Kalis

A truck moves containers after the partial suspension of a nationwide strike of dockers against a planned port reform in line with European Union laws in the port of Valencia, Spain June 21, 2017. REUTERS/Heino Kalis

A containership is docked after the partial suspension of a nationwide strike of dockers against a planned port reform in line with European Union laws in the port of Valencia, Spain June 21, 2017. REUTERS/Heino Kalis

Trucks move after the partial suspension of a nationwide strike of dockers against a planned port reform in line with European Union laws in the port of Valencia, Spain June 21, 2017. REUTERS/Heino Kalis

Containers are piled up on a ship after the partial suspension of a nationalwide strike of dockers against a planned port reform in line with European Union laws in the port of Valencia, Spain June 21, 2017. REUTERS/Heino Kalis

Containers are piled up on a ship after the partial suspension of a nationalwide strike of dockers against a planned port reform in line with European Union laws in the port of Valencia, Spain June 21, 2017. REUTERS/Heino Kalis

A policeman looks on as trucks line up to enter the port a day after a 48-hour nationalwide strike of dockers against a planned port reform in line with European Union laws in Valencia, Spain June 16, 2017. REUTERS/Heino Kalis

Trucks line up to enter the port a day after a 48-hour nationalwide strike of dockers against a planned port reform in line with European Union laws in Valencia, Spain June 16, 2017. REUTERS/Heino Kalis

Trucks line up to enter the port a day after a 48-hour nationalwide strike of dockers against a planned port reform in line with European Union laws in Valencia, Spain June 16, 2017. REUTERS/Heino Kalis

Trucks line up to enter the port a day after a 48-hour nationalwide strike of dockers against a planned port reform in line with European Union laws in Valencia, Spain June 16, 2017. REUTERS/Heino Kalis

Trucks line up to enter the port a day after a 48-hour nationalwide strike of dockers against a planned port reform in line with European Union laws in Valencia, Spain June 16, 2017. REUTERS/Heino Kalis

Trucks and cars line up to enter the port a day after a 48-hour nationalwide strike of dockers against a planned port reform in line with European Union laws in Valencia, Spain June 16, 2017. REUTERS/Heino Kalis

Idle cranes are seen during the first day of a 48-hour nation-wide strike of dockers against a planned port reform in line with European Union laws in the port of Algeciras, Spain June 14, 2017. REUTERS/Jon Nazca

Idle trucks and cranes are seen during the first day of a 48-hour nation-wide strike of dockers against a planned port reform in line with European Union laws in the port of Algeciras, Spain June 14, 2017. REUTERS/Jon Nazca

The entrance for trucks to a cargo terminal is seen closed next to idle cranes during the first day of a 48-hour nation-wide strike of dockers against a planned port reform in line with European Union laws in the port of Algeciras, Spain June 14, 2017. REUTERS/Jon Nazca

A parking for trucks is seen empty next to idle cranes during the first day of a 48-hour nation-wide strike of dockers against a planned port reform in line with European Union laws in the port of Algeciras, Spain June 14, 2017. REUTERS/Jon Nazca

A ferry sails past containers at a cargo terminal during the first day of a 48-hour nation-wide strike of dockers against a planned port reform in line with European Union laws in the port of Algeciras, Spain June 14, 2017. REUTERS/Jon Nazca

Idle cranes are seen during the first day of a 48-hour nation-wide strike of dockers against a planned port reform in line with European Union laws in the port of Algeciras, Spain June 14, 2017. REUTERS/Jon Nazca

A tugboat sails during the first day of a 48-hour nation-wide strike of dockers against a planned port reform in line with European Union laws in the port of Valencia, Spain June 14, 2017. REUTERS/Heino Kalis

Ships are docked past idle cranes during the first day of a 48-hour nation-wide strike of dockers against a planned port reform in line with European Union laws in the port of Valencia, Spain June 14, 2017. REUTERS/Heino Kalis

Idle cranes and containers are seen during the first day of a 48-hour nation-wide strike of dockers against a planned port reform in line with European Union laws in the port of Valencia, Spain June 14, 2017. REUTERS/Heino Kalis

A police van is parked at the entrance of the port during the first day of a 48-hour nation-wide strike of dockers against a planned port reform in line with European Union laws in Valencia, Spain June 14, 2017. REUTERS/Heino Kalis

Idle cranes are seen during the first day of a 48-hour nation-wide strike of dockers against a planned port reform in line with European Union laws in the port of Valencia, Spain June 14, 2017. REUTERS/Heino Kalis

A ship is docked past idle cranes during the first day of a 48-hour nation-wide strike of dockers against a planned port reform in line with European Union laws in the port of Valencia, Spain June 14, 2017. REUTERS/Heino Kalis

Dockers leave after working at a cargo terminal on the second day of a three-day strike by Spanish port workers to protest the reform of operations, aimed at liberalising hiring practices, in Algeciras, Spain June 7, 2017. REUTERS/Jon Nazca

A docker leaves the cabin of a crane after working at a cargo terminal on the second day of a three-day strike by Spanish port workers to protest the reform of operations, aimed at liberalising hiring practices, in Algeciras, Spain June 7, 2017. REUTERS/Jon Nazca

Dockers leave after working at a cargo terminal on the second day of a three-day strike by Spanish port workers to protest the reform of operations, aimed at liberalising hiring practices, in Algeciras, Spain June 7, 2017. REUTERS/Jon Nazca

A docker leaves the cabin of a crane after working in a cargo terminal on the second day of a three-day strike by Spanish port workers, to protest the reform of operations, aimed at liberalising hiring practices, in Algeciras, Spain June 7, 2017. REUTERS/Jon Nazca

A docker stretches out his legs inside a cabin of a crane as he waits to load a container in a cargo terminal on the second day of a three-day strike by Spanish port workers to protest the reform of operations, aimed at liberalising hiring practices, in Algeciras, Spain June 7, 2017. REUTERS/Jon Nazca

Containers are seen on the second day of a nation-wide intermittent strike of dockers against a planned port reform in line with European Union laws, in the port of Marin, Spain June 7, 2017. REUTERS/Miguel Vidal

Cranes remain idle during the second day of a nation-wide intermittent strike of dockers against a planned port reform in line with European Union laws, in the port of Marin, Spain June 7, 2017. REUTERS/Miguel Vidal

Cranes remain idle during the second day of a nation-wide intermittent strike of dockers against a planned port reform in line with European Union laws, in the port of Marin, Spain June 7, 2017. REUTERS/Miguel Vidal

A docker leaves a cabin of a crane after working one hour In a cargo terminal during the first day of an announced 3-day strike at the port of Algeciras, Spain June 5, 2017. REUTERS/Jon Nazca

A docker leaves a cabin of a crane after working one hour in a cargo terminal during the first day of an announced 3-day strike at the port of Algeciras, Spain June 5, 2017. REUTERS/Jon Nazca

Dockers leave the cabins of cranes after working one hour in a cargo terminal during the first day of an announced 3-day strike at the port of Algeciras, Spain June 5, 2017. REUTERS/Jon Nazca

Cranes remain idle during the first day of a nation-wide intermittent strike of dockers against a planned port reform in line with European Union laws, in the port of Valencia, Spain June 5, 2017. REUTERS/Heino Kalis

Cranes remain idle during the first day of a nation-wide intermittent strike of dockers against a planned port reform in line with European Union laws, in the port of Valencia, Spain June 5, 2017. REUTERS/Heino Kalis

Cranes remain idle during the first day of a nation-wide intermittent strike of dockers against a planned port reform in line with European Union laws, in the port of Valencia, Spain June 5, 2017. REUTERS/Heino Kalis

Cranes remain idle during the first day of a nation-wide intermittent strike of dockers against a planned port reform in line with European Union laws, in the port of Valencia, Spain June 5, 2017. REUTERS/Heino Kalis

Cranes remain idle during the first day of a nation-wide intermittent strike of dockers against a planned port reform in line with European Union laws, in the port of Valencia, Spain June 5, 2017. REUTERS/Heino Kalis

A docker unloads a cargo at the Port 2000 terminal in the Port of Le Havre, France March 14, 2017. REUTERS/Benoit Tessier

Dockers are reflected in a mirror as they unload a cargo at the Port 2000 terminal in the Port of Le Havre, France March 14, 2017. REUTERS/Benoit Tessier

A docker unloads a cargo at the Port 2000 terminal in the Port of Le Havre, France March 14, 2017. REUTERS/Benoit Tessier

A docker is silhouetted inside the cabin of a crane as he loads a container onto a truck in a cargo terminal at the port of Algeciras, southern Spain, March 3, 2017. REUTERS/Jon Nazca