ThatDanishGamer said:
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http://www.neogaf.com/forum/showthread.php?t=10423
http://vgsales.wikia.com/wiki/NPD_2007_sales_figures
http://vgsales.wikia.com/wiki/NPD_2008_sales_figures
http://vgsales.wikia.com/wiki/NPD_2009_sales_figures
http://vgsales.wikia.com/wiki/NPD_2010_sales_figures