hey,
Estonia has a VERY impressive growth approaching 5%: https://www.vyncke.org/ipv6status/plotpenetration.php?country=ee
I have been driving an IPv6 project in Elion (now called Estonian Telekom) for some time now and this is the result. One of the goals I set for myself was exactly such aggressive result.
We have enabled native v6 for all our users and everyone with suitable last-gen CPE can use it automatically.
I will do technical writeup on the tech we are using after we get our PR out (which should be soon).
-- tarko
