Question: Starbucks and Fair Trade

I am looking for information on how much Fair Trade coffee Starbucks sells? How much of it is fair trade versus non-fair trade?? How much of the fair trade that they do sell is served made and how much is sold by the pound for making at home?? I know that Starbucks made a deal with TransFair USA to sell fair trade coffee (in 2001?). I feel like I have heard that the actual quantity they sell is far below what their marketing campaign leads people to believe. I have looked for percentages of how much of their coffee is fair trade, but I am not finding it. Any help on this and related info would be awesome.