There was a nice 10 year overview of git linked from the article https://www.atlassian.com/git/articles/10-years-of-git/ I think Atlassian are great sports for featuring GitLab (that competes with their Bitbucket and Stash products) in there, thanks!
Kind of a nitpick, but that infographic shows that in 2014 Git was used by 33% of developers. Atlassian didn't say which source that came from, but I'm going to guess it came from a 2014 Eclipse Community Survey of 876 respondents[1][2].
I found the poll a bit misleading. There were separate categories for Git and GitHub, but AFAIK you were only supposed to choose one. I'd wager most of the GitHub users are also using Git, so the graph would look more like this[3].
