From W3C.

2012Internet ExplorerFirefoxChromeSafariOpera
December14.7 %31.1 %46.9 %4.2 %2.1 %


I figured down to 30% or so, not < 15%. I think Google's TV campaign must have helped over the last bit. You rarely see Microsoft TV ads except during the Simpsons and Family Guy on Sundays.