I live in Finland and even I am sceptical of this figure. Maybe that’s because I go once a year.
I will say it’s very very common for folks to use the library for its primary purpose of renting books - which of course requires a visit twice in a month - once to collect and once to return.
On the return trip, you collect another set of books, making it a habit.
On the return trip, you collect another set of books, which you then also have to return in two weeks.