Pixel widths - number of themes that use them as a step

1280 - 2
1200 - 2
1152 - 1
1066 - 1
1050 - 1
1024 - 4
1000 - 1

992 - 1
980 - 1
979 - 1
960 - 1
959 - 7
880 - 2
870 - 1
850 - 2
800 - 12

770 - 1
768 - 4
767 - 14
766 - 1

660 - 1
650 - 5
640 - 3
620 - 2
608 - 1
600 - 4
600 - 1

500 - 2

480 - 10
479 - 1
450 - 5
400 - 5


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screen widths
http://lifehacker.com/5428806/whats-your-screen-resolution
	1680 - 20%
	1920 - 10%
	1024 - 3%
	1280 - 11%
	1440 - 14%

http://gs.statcounter.com/#resolution-ww-monthly-201105-201205
	1024 - 17%
	1366 - 20%
	1280 - 20%
	1440 - 7%
	1920 - 5%

http://www.w3counter.com/globalstats.php
	1366 - 18%
	1024 - 15%
	1280 - 20%
	1440 - 6%
	1920 - 5%

* Bear in mind that screen resolution is the *maximum* browser width. Anyone can view the web with a browser that only uses a percentage of their screen.
http://css-tricks.com/screen-resolution-notequalto-browser-window/
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range
1920 - 400 pixels
5 - 20%