[jeroenhd]

Going by the "80 million" comment and the map you've linked, the countries that come closest are Germany (±60%), Iran (0.34%), and Turkey (1.79%).

Iran has an oppressive government with severe internet restrictions, so I'm not surprised they're not making IPv6 a priority. I'd assume their traffic interception devices don't work all that well without IPv4, they never seem to.

With 1.79% being IPv6 capable (not even configured), I'd say availability is effectively 0%. It's technically 2%, but I'd imagine those 2% are mostly hosting services and such.

Reverse sort the availability table and lots of countries have availability below even 5%. Nigeria, the 7th most populated country in the world, is at 0.38%. Lithuania, part of the EU and its economic bloc, is at 0.16%.