That’s under 8% of the population buying the book or receiving it as a gift and some percentage of them reading it.

8% of a population doing any singular thing is rather significant.

For instance: in the 90's less than 10% (but more than 5%) of British people were going to university. But that has profound effects on the population.

Going to the university at any one moment. 1/4th of the UK workforce has a collage degree.

Aka more than 25% of 18-20 year where in collage in the UK.

You say "under 8% of the population" having a copy of the book as if that doesn't make it almost as popular as the Bible.

There’s been roughly 1 copy of the Bible printed per person alive on the earth. Not all of them are still around, but it’s likely there is still at least 1 copy per 2 people.

According to Statista, 85% of Swedes self-identify as either "non-practicing Christians" or "religiously unaffiliated", unlikely they have a bible at home if that's accurate. "Church-attending Christians" come up as 8%, and are likely to have a bible at home. "almost as popular as the Bible" seems, if Statista is right, very likely.

https://www.statista.com/statistics/909409/religious-identif...

A better comparison would be against Bible sales during 2017-2018.

8% of a population owning a book is friggin huge, don't try to portray it as not.