Windows 7 - 47.01%
Windows 10 - 21.13%
Windows XP - 10.34% ( Still in Use / I use it every day for testing purposes )
...
Windows 2000 - 0.00% ( I have one / I use it a couple of times per week for testing purposes )
...
PS:
Windows 95 is Not on the list at all. I have a Pan Europian Edition installed on an Acer Aspire One Netbook with Intel Atom N270 Dual Core CPU. On that little computer Windows 95 is very-Very-VERY fast and stable. I use it a couple of times per month for testing purposes.
