So by endings you mean TLDs? And by “X% of endings were registered with the word Y” you mean “X% of all TLDs have ‘Y’ registered” or “‘Y’ is already registered with X% of all TLDs”?
It doesn’t make sense without an explanation.
It doesn’t make sense without an explanation.
It seems "domain ending" might be a somewhat common way to describe a TLD in lay terms. That said, I am a geek and a curmudgeon, so I still think writing out top-level domain makes the most sense in such a context.