> That's a weird way of putting it

France is offset by at least one hour from its actual time zone, Portugal by two. I don’t really see what’s weird here. It’s exactly the effect of year long DST. It goes all the way to two and three hours in summer.

Apparently people don’t really care about the winter mornings when they are used to it because approximately no one wants to get back to a normal time zone there. Some people are even arguing for keeping the even more extreme DST year long.

I will hazard that your stats from the 70s have everything to do with habits and very little to do with the actual effect of shifting time long term.