Completing what I started here, I’ve charted the numbers from Christophe’s data for C++11, C++11 Concurrency, C++14 and C++17.

The data is taken entirely from the linked pdf with one exception: N3664 is a clarification that permits optimization, not a requirement for compliance. Compilers that do not perform this optimization are no less compliant with C++14. I’ve recomputed the percentages for all compiler versions to take this into account.

In addition to the references from the previous post, the approval date of C++14 was taken from http://en.wikipedia.org/wiki/C++14