I was a bit hesitant about the information provided, but the data is from a survey conducted by Millward Brown and it includes both an explanation of the method

I was a bit hesitant about the information provided, but the data is from a survey conducted by Millward Brown and it includes both an explanation of the methodology and a survey example. http://en.wikipedia.org/wiki/Millward_Brown http://en.wikipedia.org/wiki/Millward_Brown http://www.adobe.com/products/player_census/methodology/ http://www.adobe.com/products/player_census/methodology/ http://www.adobe.com/products/flash/survey/npd_survey/ http://www.adobe.com/products/flash/survey/npd_survey/