That's % of desktop users (desktop use itself is declining rapidly - I don't know anyone non-tech who uses a PC/Laptop and most devs should be mobile/tablet-first now). Also that was before the big "please upgrade" message Microsoft send out to everyone using IE8/9/10.
If it was purely about numbers, I'd attempt to support to Opera Mini and it's 300 million users. But I don't, and I've never met anyone who does, yet some people bring up IE10 support on a React-driven, Mobile-first web app to appease managers who have always wanted support for older versions of IE "just because". Unless the clients are government/big bank I can't really see any justification for supporting them (and no one supports IE8 - even though it has double the usage IE10 has).
If it was purely about numbers, I'd attempt to support to Opera Mini and it's 300 million users. But I don't, and I've never met anyone who does, yet some people bring up IE10 support on a React-driven, Mobile-first web app to appease managers who have always wanted support for older versions of IE "just because". Unless the clients are government/big bank I can't really see any justification for supporting them (and no one supports IE8 - even though it has double the usage IE10 has).