University students and public sector employees on indefinite strike protest in front of Presidential house against a tax reform proposed by the government in San Jose, Costa Rica September 13, 2018. REUTERS/Juan Carlos Ulate

University students and public sector employees on indefinite strike march against a tax reform proposed by the government in San Jose, Costa Rica September 13,2018. REUTERS/Juan Carlos Ulate

University students and public sector employees on indefinite strike march against a tax reform proposed by the government in San Jose, Costa Rica September 13,2018. REUTERS/Juan Carlos Ulate

University students and public sector employees on indefinite strike march against a tax reform proposed by the government in San Jose, Costa Rica September 13,2018. REUTERS/Juan Carlos Ulate

University students and public sector employees on indefinite strike march against a tax reform proposed by the government, in San Jose, Costa Rica September 13,2018. REUTERS/Juan Carlos Ulate

Riot policemen arrive to reinforce their colleagues during a march of public sector employee on indefinite strike against a tax reform proposed by the government in San Jose, Costa Rica September 12,2018. REUTERS/Juan Carlos Ulate

Riot policemen block the entrance to the building of the Legislative Assembly as public sector employee on indefinite strike trying to enter during march against a tax reform proposed by the government in San Jose, Costa Rica September 12,2018. REUTERS/Juan Carlos Ulate

Riot policemen block the entrance to the building of the Legislative Assembly as public sector employee on indefinite strike trying to enter during march against a tax reform proposed by the government in San Jose, Costa Rica September 12,2018. REUTERS/Juan Carlos Ulate

Riot policemen block the entrance to the building of the Legislative Assembly as public sector employee on indefinite strike trying to enter during march against a tax reform proposed by the government in San Jose, Costa Rica September 12,2018. REUTERS/Juan Carlos Ulate

Public sector employees on indefinite strike shout slogan in front of riot police during a march against a tax reform proposed by the government in San Jose, Costa Rica September 12, 2018. REUTERS/Juan Carlos Ulate

Two public sector employees on indefinite strike rest after a march against a tax reform proposed by the government in San Jose, Costa Rica September 12,2018. The signs says "To live in Costa Rica and to have such poor brains in power". REUTERS/Juan Carlos Ulate

Public sector employee on indefinite strike shout slogan during march against a tax reform proposed by the government in San Jose, Costa Rica September 12,2018. REUTERS/Juan Carlos Ulate

Public sector employee on indefinite strike shout slogan during march against a tax reform proposed by the government in San Jose, Costa Rica September 12,2018. REUTERS/Juan Carlos Ulate

A public sector employee on indefinite strike holds a signs says "Just do not pay like millionaires" during march against a tax reform proposed by the government in San Jose, Costa Rica September 12,2018. REUTERS/Juan Carlos Ulate

Public sector employees on indefinite strike rest after a march against a tax reform proposed by the government in San Jose, Costa Rica September 12,2018. REUTERS/Juan Carlos Ulate

A public sector employee on indefinite strike holds a signs says "Fiscal fraud, fiscal deficit" during march against a tax reform proposed by the government in San Jose, Costa Rica September 12,2018. REUTERS/Juan Carlos Ulate

A signs says "If there is no justice for the people, there is no peace for the government" is seen during a march of the public sector employee on indefinite strike against a tax reform proposed by the government in San Jose, Costa Rica September 12,2018. REUTERS/Juan Carlos Ulate

A public sector employee on indefinite strike holds a signs says "No to the tax plan" during march against a tax reform proposed by the government in San Jose, Costa Rica September 12,2018. REUTERS/Juan Carlos Ulate

Thousands of public sector employees on indefinite strike march against a tax reform proposed by the government in San Jose, Costa Rica September 12,2018. REUTERS/Juan Carlos Ulate

Public sector employees on indefinite strike march against a tax reform proposed by the government in San Jose, Costa Rica September 12,2018. The sign says "No more taxes to Costa Rica. Look for plan b, the tax plan does not go". REUTERS/Juan Carlos Ulate

Thousands of public sector employees on indefinite strike march against a tax reform proposed by the government in San Jose, Costa Rica September 12,2018. REUTERS/Juan Carlos Ulate

Thousands of public sector employees on indefinite strike march against a tax reform proposed by the government in San Jose, Costa Rica September 12,2018. REUTERS/Juan Carlos Ulate

Thousands of public sector employees on indefinite strike march against a tax reform proposed by the government in San Jose, Costa Rica September 12,2018. REUTERS/Juan Carlos Ulate

Thousands of public sector employees on indefinite strike march against a tax reform proposed by the government in San Jose, Costa Rica September 12,2018. REUTERS/Juan Carlos Ulate

Thousands of public sector employees on indefinite strike march against a tax reform proposed by the government in San Jose, Costa Rica September 12,2018. REUTERS/Juan Carlos Ulate

Thousands of public sector employees on indefinite strike march against a tax reform proposed by the government in San Jose, Costa Rica September 12,2018. REUTERS/Juan Carlos Ulate

A man works in construction while public sector employees on indefinite strike take part in a march against a tax reform proposed by the government in San Jose, Costa Rica September 11, 2018. REUTERS/Juan Carlos Ulate TPX IMAGES OF THE DAY

Public sector employees on indefinite strike march against a tax reform proposed by the government in San Jose, Costa Rica September 11, 2018. REUTERS/Juan Carlos Ulate

Public sector employees on indefinite strike march against a tax reform proposed by the government in San Jose, Costa Rica September 11, 2018. REUTERS/Juan Carlos Ulate

Public sector employees on indefinite strike march against a tax reform proposed by the government in San Jose, Costa Rica September 11, 2018. REUTERS/Juan Carlos Ulate

A man works in construction while public sector employees on indefinite strike take part in a march against a tax reform proposed by the government in San Jose, Costa Rica September 11, 2018. REUTERS/Juan Carlos Ulate

A public sector employee holds a signs reading "A teacher fighting is also teaching" during a march against a tax reform proposed by the government in San Jose, Costa Rica September 10, 2018. REUTERS/Juan Carlos Ulate

Public sector employees on indefinite strike march against a tax reform proposed by the government in San Jose, Costa Rica September 10, 2018. REUTERS/Juan Carlos Ulate

Public sector employees on indefinite strike march against a tax reform proposed by the government in San Jose, Costa Rica September 10, 2018. REUTERS/Juan Carlos Ulate

A public sector employee holds a poster reading "Education resists" during a march against a tax reform proposed by the government in San Jose, Costa Rica September 10, 2018. REUTERS/Juan Carlos Ulate

Public sector employees on indefinite strike march against a tax reform proposed by the government in San Jose, Costa Rica September 10, 2018. REUTERS/Juan Carlos Ulate

Public sector employees on indefinite strike march against a tax reform proposed by the government in San Jose, Costa Rica September 10, 2018. REUTERS/Juan Carlos Ulate

A public sector employee holds a signs that says "Neither legal nor illegal, strike is strike" during a march against a tax reform proposed by the government in San Jose, Costa Rica September 10, 2018. REUTERS/Juan Carlos Ulate

Public sector employees on indefinite strike march against a tax reform proposed by the government in San Jose, Costa Rica September 10, 2018. REUTERS/Juan Carlos Ulate

French public sector workers and labour unions take part in a demonstration against French government reforms in Nantes, France, November 16, 2017. REUTERS/Stephane Mahe

French public sector workers and labour unions take part in a demonstration against French government reforms in Nantes, France, November 16, 2017. REUTERS/Stephane Mahe

French public sector workers and labour unions take part in a demonstration against French government reforms in Nantes, France, November 16, 2017. The banner reads "No to the break-up of the labour law and public services. Stop austerity policies and gifts for bosses". REUTERS/Stephane Mahe

French public sector workers and labour unions take part in a demonstration against French government reforms in Marseille, France, November 16, 2017. The slogan reads "Macron, take your pension and not ours". REUTERS/Jean-Paul Pelissier

Arcelor Mittal steel workers dressed in protective work suits attend a demonstration with French public sector workers and labour unions against French government reforms in Marseille, France, November 16, 2017. REUTERS/Jean-Paul Pelissier

Arcelor Mittal steel workers dressed in protective work suits attend a demonstration with French public sector workers and labour unions against French government reforms in Marseille, France, November 16, 2017. REUTERS/Jean-Paul Pelissier

Jean-Luc Melenchon, leader of Far-left opposition "France Insoumise" (France Unbowed) party, attends a demonstration with French public sector workers and labour unions against French government reforms in Marseille, France, November 16, 2017. REUTERS/Jean-Paul Pelissier

Jean-Luc Melenchon, leader of Far-left opposition "France Insoumise" (France Unbowed) party, attends a demonstration with French public sector workers and labour unions against French government reforms in Marseille, France, November 16, 2017. A placard reads "We won't miss work when it's gone". REUTERS/Jean-Paul Pelissier

Jean-Luc Melenchon, leader of Far-left opposition "France Insoumise" (France Unbowed) party, talks to journalists as he attends a demonstration with French public sector workers and labour unions against French government reforms in Marseille, France, November 16, 2017. REUTERS/Jean-Paul Pelissier

Jean-Luc Melenchon, leader of Far-left opposition "France Insoumise" (France Unbowed) party, attends a demonstration with French public sector workers and labour unions against French government reforms in Marseille, France, November 16, 2017. REUTERS/Jean-Paul Pelissier

Jean-Luc Melenchon, leader of Far-left opposition "France Insoumise" (France Unbowed) party, attends a demonstration with French public sector workers and labour unions against French government reforms in Marseille, France, November 16, 2017. REUTERS/Jean-Paul Pelissier

French public sector workers and labour unions take part in a demonstration against French government reforms in Nantes, France, November 16, 2017. The banner reads "No to the break-up of the labour law and public services. Stop austerity policies and gifts for bosses". REUTERS/Stephane Mahe

French public sector workers and labour unions take part in a demonstration against French government reforms in Nantes, France, November 16, 2017. The banner reads "No to the break-up of the labour law and public services. Stop austerity policies and gifts for bosses". REUTERS/Stephane Mahe

Television cameramen struggle in front the opening banner of a demonstration of public sector workers and labour unions who take part in a nationwide strike against French government reforms in Paris, France, October 10, 2017. REUTERS/Charles Platiau

Television cameramen struggle in front the opening banner of a demonstration of public sector workers and labour unions who take part in a nationwide strike against French government reforms in Paris, France, October 10, 2017. REUTERS/Charles Platiau

A demonstrator holds a flag depicting revolutionary hero Che Guevara during a protest of public sector workers and labour unions who take part in a nationwide strike against French government reforms in Paris, France, October 10, 2017. REUTERS/Charles Platiau

Protesters dressed as wicthes attend a demonstration of public sector workers and labour unions who take part in a nationwide strike against French government reforms in Paris, France, October 10, 2017. The slogan reads "a resign or a spell". REUTERS/Charles Platiau

Protestors dressed as wicthes attend a demonstration of public sector workers and labour unions who take part in a nationwide strike against French government reforms in Paris, France, October 10, 2017. REUTERS/Charles Platiau

Protestors dressed as wicthes attend a demonstration of public sector workers and labour unions who take part in a nationwide strike against French government reforms in Paris, France, October 10, 2017. REUTERS/Charles Platiau

A woman wears glasses with the logo of French CGT trade union as she takes part in a demonstration of public sector workers and labour unions who take part in a nationwide strike against French government reforms in Paris, France, October 10, 2017. REUTERS/Charles Platiau