It's 2012! Mercurial and Git are both still strong.
I understand the trade-offs of both. I also understand everyone has some sort of preference for one or the other. That's fine.
I'm looking for some information on level of usage of both. For example, on stackoverflow.com, searching for GitGit gets you 12000 hits, MercurialMercurial gets you 3000. Google Trends says it's 1.9:1.0 for Git.
What other empirical information is available to estimate the relative usage of both tools?