[kluge]

Well, we are talking about Finland.

http://www.stat.fi/tup/suoluk/suoluk_asuminen_en.html

By the latest numbers there are 1 266 000 residential buildings in Finland, housing 1 581 000 saunas. But of course other buildings also have saunas, so in total there are more than 2 million saunas.

There are 5 451 270 people in Finland.

I'd say a lot of people have access to saunas.