spoiler
Via https://radar.cloudflare.com/adoption-and-usage
Here is a different source with slightly different results https://www.6connect.com/blog/global-adoption-of-ipv6-top-ten-countries/
For fun you can comment your guesses first :)
this post was submitted on 27 Sep 2023
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A common requirement in government contracts is "there must be no IPv6 support, and if there is it must be verifiably disabled to decrease the size of the vulnerability surface."
Many years ago, that misconfigured firewall that let IPv6 traffic through without even bothering to log it, resulting in a years-long compromise scared a lot of govvies, but unfortunately it taught them the wrong lesson.
Source: I'm a former Beltway Bandit.
The wrong lesson?
I'm not sure how reducing your attack surface area is the wrong lesson here.
The wrong lesson learned was, "don't use IPv6." Which has, to a large extent, hurt the uptake of IPv6 everywhere, because "if the government doesn't use it, we're not going to use it." Rather than do something sensible, like enable the IPv6 functionality of the firewalls and configure them properly.