Someone else will probably come along with actual figures, but from my subjective experience, Poland, Spain, and Italy do pretty well, as do England and Ireland (though the latter is degrading quickly). German Catholics are pretty good about attending; I don’t know about Austria. I’d class Italy and Belgium as “medium”, and France and the rest of the Eastern European countries are pretty disappointing, though there is still a backbone of faithful Catholics, however here in France they are aging out, whereas in Eastern Europe the trend is a bit less negative.
For reference, I’d also call Americans “good” about attending, so my baseline already assumes that there are a significant portion of people who call themselves Catholic but don’t follow the Church’s precepts. I’m comparing the European countries to that baseline in the paragraph above (and, again, I’m doing so subjectively).
All in all, though, the picture in Europe is one of decline, in stark contrast to Asia and Africa where there is clear growth.