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I went to the site of Screendigest and the graph is most likely from this report:

http://www.screendigest.com/reports/07nextgencons/readmore/view.html

 Of course I can't read it since it's not free, but the free sample shows the report is from January 2007. And since it will take a while to write a report I think it's safe to say this report takes none or almost none of the actual sales data from Wii and PS3 into account.