Market share held by the leading computer operating systems in the United States from January 2009 to September 2013

  Win7 MacOSX WinXP WinVista iOS Win 8
Jan 09 - 6.73% 68.55% 22.14% - -
Mar 09 0.24% 8.35% 58.55% 29.88% - -
May 09 0.49% 8.56% 54.05% 33.54% - -
Jul 09 0.92% 10.43% 51.37% 34.36% - -
Sep 09 1.51% 10.95% 49.62% 35.31% - -
Nov 09 4.3% 12.21% 46.94% 34.22% - -
Jan 10 9.73% 12.94% 43.71% 31.29% - -
Mar 10 13.59% 12.82% 43.1% 28.44% - -
May 10 15.89% 13.04% 41.84% 27.03% 0.09% -
Jul 10 19.51% 11.95% 39.86% 26.46% 0.32% -
Sep 10 21.68% 13.78% 38.53% 23.62% 0.48% -
Nov 10 24.19% 14.66% 35.81% 22.88% 0.61% -
Jan 11 27.86% 14.94% 33.2% 21.23% 1% -
Mar 11 30.84% 14.97% 32.17% 19.28% 1.04% -
May 11 32.9% 15.08% 30.68% 18.11% 1.41% -
Jul 11 36.6% 15.09% 26.63% 17.88% 1.88% -
Sep 11 39.87% 14.82% 25.72% 15.97% 1.92% -
Nov 11 39.67% 13.64% 26.75% 16.24% 2.02% -
Jan 12 41.16% 14.79% 23.48% 15.62% 3% -
Mar 12 44.02% 15.48% 22.3% 12.68% 3.36% -
May 12 45.84% 15.34% 20.56% 11.95% 3.79% -
Jul 12 48.86% 13.61% 18.09% 12.46% 4.26% -
Sep 12 49.36% 15.05% 16.42% 11.67% 4.77% 0.21%
Nov 12 50.35% 15.19% 15.08% 10.63% 4.98% 1.16%
Jan 13 49.34% 14.64% 14.28% 9.99% 5.69% 2.83%
Mar 13 49.14% 13.93% 13.63% 9.25% 6.27% 4.4%
May 13 51.91% 12.46% 11.72% 8.76% 5.08% 5.76%
Jul 13 47.32% 14.1% 11.67% 8.34% 6.52% 7.3%
Sep 13 46.58% 12.55% 14.69% 8.5% 5.84% 7.63%
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This statistic shows the market share held by the leading PC operating systems in the U.S. since January 2009. In March 2013, Windows 7 had a market share of 49.14 percent and was by far the leading operating system in use.

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Additional information
You can find additional information about this statistic on statista.com
http://www.statista.com/statistics/272667/market-share-held-by-operating-systems-in-the-us-since-2009/