The answer to this question ultimately depends on several factors such as a country's literacy rate, the availability of books and libraries, the level of education, and the cultural acceptance of reading.
From a quantitative perspective, Finland is widely regarded as the country that reads the most books overall. This is likely due to their high score on the UN's 2018 Education Index and their access to a variety of books, both physical and digital. According to Statista, in 2020, 74.3% of the physical books published in Finland are in Finnish, while 21% are in Swedish, and 4.7% are in other languages. At the same time, Finland has over 500 public libraries and an average of 10.7 books per person.
Meanwhile, Norway also ranks high when it comes to reading books, with an average of 11.9 books per person and over 500 public libraries in the country. According to Statista, in 2020, 33% of physical books published in Norway are in Norwegian, while 29.9% are in English and 37.1% are in other languages.
In terms of digital books, the United States leads in terms of publishing the most digital books, with an average of more than 4,500 books published every day. The US also has an extensive library system with over 17,000 public libraries and an average of 4.17 books per person.
Ultimately, what country reads the most books really depends on several criteria, such as a country's access to literary resources, their literacy rate, the availability of libraries, the level of education and the cultural acceptance of reading.
References:
https://en.wikipedia.org/wiki/UN_Education_Index
https://www.statista.com/statistics/725825/finland-languages-of-physical-book-titles-published/
https://www.statista.com/statistics/722520/norway-languages-of-physical-book-titles-published/
https://www.statista.com/statistics/326444/average-number-of-books-per-person-in-selected-countries/
https://www.statista.com/statistics/586726/number-of-e-books-published-in-the-us/
https://www.thesimpledollar.com/how-many-public-libraries-are-there-in-the-us/
