This is a rapid pace since your stats were Sept and mine are Nov..
http://blog.foxtailtech.com/post/101784527520/windows-8-and-8-1-finally-pass-15-market-share
Seems XP is still used twice as much as Windows 8 & 8.1 combined.
http://cdn.arstechnica.net/wp-content/uploads/2014/10/os-2014-09.png

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