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I would like to have the statistics on 'How much Finnish people read?' how much they read books, how much they buy, how often they use library? in whole…

You can see the statistics about lending and library use on Libraries.fi website: https://www.libraries.fi/statistics?language_content_entity=en 

In 2017, 77% of >10 year old Finns read at least one book in a 6 month period. More statistics about that in the Statistics Finland website (in finnish): http://www.stat.fi/til/vpa/2017/03/vpa_2017_03_2019-04-25_kat_001_fi.html

Yle has written an article in english about the above statistics: https://yle.fi/uutiset/osasto/news/more_people_read_in_finland__but_fewer_books_per_year/10755536

Book sales in 2017 was 549 million euros. Source: Statistics Finland https://www.stat.fi/til/jvie/2017/jvie_2017_2018-11-23_tie_001_en.html