Relative, it is. Going front 2% to 2.32% (for example) is pretty good, though I don't know where these numbers come from because the latest I saw had Linux at about 5%, and growing by something like 50-100% per year (for a year). Sure, the total number compared to Windows looks small, but compared to where it was it's growing incredibly quickly.

Edit: Someone said that was monthly, in which case yeah, that's pretty fucking big.