Here's the precise citation:
"The Centre for Medicine in the Public Interest, in the United States, predicts that counterfeit drug sales will reach US$75 globally in 2010, an increase of more than 90% from 2005."
So, now that we've given ourselves a nice pat on the back (and don't you love the quaint spelling of "Centre"), it's important to pass along the link for the WHO fact sheet. It's an important reference.
Have a look: