True. But I think my personal ratio differs significantly from the expected ratio

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I just did a check on my facebook page for fun and counted the music artists I've listed as favorites.
This was the result:
UK: 17
(The Beatles, Rolling Stones, ELO, Dire Straits, The Cult, Radiohead, Portishead, Nothing But Thieves, Depeche Mode, PJ Harvey, David Bowie, The House of Love, The Verve, Zero 7, Massive Attack, Coldplay, Muse)
Ireland: 1 (U2)
US: 14
(Iggy Pop, Khruangbin, Cigarettes After Sex, Beach House, Monster Magnet, Guns N' Roses , Infected Mushroom, Börns, R.E.M., Billie Eilish, Greta Van Fleet, Tycho, Queens of the Stone Age, Pixies)
Sweden: 3 (it fits with your calculation*) (Cult of Luna, Eggstone, Vibrasphere)
France: 2 (Air, Jean Michel Jarre)
Norway: 2 (Amethystium, Sigrid)
Canada: 1 (Grimes)
Germany: 1 (Booka Shade)
Greece: 1 (Keep Shelly In Athens)
Australia: 1 (AC/DC)
Netherlands: 1 (Easily Embarrassed)
* It fits approximately with your ratio calculation of 7x for UK, since 3x7 = 21, and I counted 17 artists from the UK. Though what I have listed on facebook is far from all artists I like, I have a HUGE music library, quite dominated by the UK and US

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