Weird that China is not highlighted on that map; makes me not trust the data.
China is shown in fig. 5 as having < 5% deployment.
That seems unlikely, given that they were one of the primary advocates of ipv6 though.
China had large blocks of IPv6 allocated early on but they only recently started using it. Part of my job involves maintaining a CDN inside China. In mid-2018 our Chinese partner were told by a government ministry “IPv6: do it, do it now” and everyone had to jump and implement it in sites that had never had it before.
APNIC published a blog post earlier this year which backs that up, as well as the 5% number: https://blog.apnic.net/2019/01/03/ipv6-in-china/
Oh, wow! Thanks!