Earlier quoted context omitted.
Except Sweden apparently. https://www.theguardian.com/business/2016/jun/04/sweden-cash...
The article you linked was on HN's or reddit's frontpage recently, that's why I wrote "most". ;o) (plus I don't know enough about every european country obviously). EDIT - looking at the date of the article it might have been not the same, but a similar one.
Sweden does seem to be this cashless outlier for some reason. [EDIT: I gather it's a Nordics thing more generally.] I think it was also featured in a Freakonomics episode fairly recently.