Debian statistics allows you to quite objectively compare the popularity of various version control systems. Git on the chart is indicated in green.
The number of installations of version control systems for 2004-2011.
Statistics are collected from users who installed the
popularity-contest (popcon) package. After installation, popcon sends a weekly email to Debian with information about the packages installed on the system and the time it was last used.
If you filter the first chart and only consider active users who have run the package in the last 30 days, then git and subversion show almost the same result.


However, if you recall that until April 2010, the git package was called git-core, then we will get more objective statistics. Here you can see that git + git-core overtook subversion back in early 2011 (among active users).
