Around Germany and Greece there were other countries. They went by names like frugal four and PIIGS. They forced "austerity" and stricter working hours onto indebted countries to save their own banks.
The colours on this map show well that northern "productivity" is not about working hours, but about other topics that did not get addressed. Among these topics are also tax heavens (think the Netherlands) and money laundering (think Austria's special relationship with Russia).
So it was nothing more than poor political leadership without vision.
Also having some... spicy thoughts about french neoliberal politicians constantly saying German workers are so much better than us lazy assholes.
My guess is cause they are rich people from Paris and based on my experience with paris, that number is actually a cumulative number of hours for everyone who lives in Paris
Yeah I have spicy thoughts for them too, would be great if they tried doing a real job to see how it feels