There's no way that graph is even remotely recent. 2008 or so. Has to be. Firefox passed IE a couple of years ago, and Chrome has to be on the verge of passing Firefox. Virtually everybody I know uses Chrome.
And I gotta tell you, as a web developer who has lost a good chunk of his life fixing the user experience on Microsoft's DELIBERATELY FUBAR BROKEN browser, I have little to no sympathy for cries of "...but I'm stuck on IE8 at work." Your only option should be (and will be before long) to pressure the ignorant PHB's to upgrade to a standards compliant browser.
The rising consensus is to completely fucking ignore IE compatibility issues for now on, and only target Chrome and Firefox. IE 10/11 are finally getting close to being compliant, so usually that experience will be pretty good. But I won't lift so much as a pinky, if I have a choice, to make something work better in IE if it already works in Chrome/Firefox.