It's hard to find dates for that type of thing (especially with sourceforge, their website seems actively mess with the wayback machine). But I dug deeper, apparently Sourceforge got support for SVN in 2006, which is a few months before google code.

2006 appears to be the year that SVN finally became somewhat mainstream, which is interesting because git was released in 2005. Github launched in 2008 and by 2009, everyone seemed to be abandoning SVN.

I feel like SVN was only really relevant for about 3 years; Maybe 5 years at most.