It peaked at 4.05% in March. The last 2 months it went just below 4% as the Unknown category increased. For June the reverse happened, so 4.04% seems to be the real current share of Linux on Desktop as desktop clients were read properly/werent spoofed.
Shit started hitting the fan when everyone started faking Netscape’s “Mozilla” user agent. Then “KHTML, like Gecko” and after that every fork kept the originating name in the string and extended it.