Protesters take part in a demonstration called by the CGT Trade Union on the place de la Nation in Paris on December 14, 2018, during a demonstration calling for strikes to push for higher wages and pensions in wake of the 'Yellow Vests' movement. (Photo by CHRISTOPHE ARCHAMBAULT / AFP)

Protesters stand by a banner reading "Education is us, stand upright" take part in a demonstration called by the CGT Trade Union on the place de la Nation in Paris on December 14, 2018, during a demonstration calling for strikes to push for higher wages and pensions in wake of the 'Yellow Vests' movement. (Photo by CHRISTOPHE ARCHAMBAULT / AFP)

Protesters stand by a banner reading "Education is us, stand upright" take part in a demonstration called by the CGT Trade Union on the place de la Nation in Paris on December 14, 2018, during a demonstration calling for strikes to push for higher wages and pensions in wake of the 'Yellow Vests' movement. (Photo by Christophe ARCHAMBAULT / AFP)

People take part in a demonstration called by the CGT Trade Union on the place de la Nation in Paris on December 14, 2018, calling for strikes to push for higher wages and pensions in wake of the 'Yellow Vests' movement. (Photo by Christophe ARCHAMBAULT / AFP)

People take part in a demonstration called by the CGT Trade Union in Paris on December 14, 2018, calling for strikes to push for higher wages and pensions in wake of the 'Yellow Vests' movement. (Photo by Christophe ARCHAMBAULT / AFP)

A protester carrying a cardboard reading "The Paris Commune or death" takes part in a demonstration called by the CGT Trade Union in Paris on December 14, 2018, calling for strikes to push for higher wages and pensions in wake of the 'Yellow Vests' movement. (Photo by Christophe ARCHAMBAULT / AFP)

French riot police look at protester taking part in a demonstration on the Place de la Nation in Paris on December 14, 2018, called by the CGT Trade Union calling for strikes to push for higher wages and pensions in wake of the 'Yellow Vests' movement. (Photo by Christophe ARCHAMBAULT / AFP)

People take part in a demonstration in Paris on December 14, 2018, called by the CGT Trade Union calling for strikes to push for higher wages and pensions in wake of the 'Yellow Vests' movement. (Photo by Christophe ARCHAMBAULT / AFP)

High school students take part in a demonstration called by the CGT Trade Union in Paris on December 14, 2018 calling for higher wages and pensions in the wake of the 'Yellow Vests' movement. (Photo by Julie SEBADELHA / AFP)

High school students take part in a demonstration called by the CGT Trade Union in Paris on December 14, 2018 calling for higher wages and pensions in the wake of the 'Yellow Vests' movement. (Photo by Julie SEBADELHA / AFP)

High school students take part in a demonstration called by the CGT Trade Union in Paris on December 14, 2018 calling for higher wages and pensions in the wake of the 'Yellow Vests' movement. (Photo by Julie SEBADELHA / AFP)

High school students take part in a demonstration called by the CGT Trade Union in Paris on December 14, 2018 calling for higher wages and pensions in the wake of the 'Yellow Vests' movement. (Photo by Julie SEBADELHA / AFP)

People take part in a demonstration called by the CGT Trade Union in Paris on December 14, 2018, calling for strikes to push for higher wages and pensions in wake of the 'Yellow Vests' movement. (Photo by Julie SEBADELHA / AFP)