according to the NY Times - information supplied by NPD
NPD’s annual survey of Internet users, which is some 80 percent of the population these days, found that 10 percent of the music they acquired last year came from paid downloads. That is a big increase from 7 percent in 2006. But since the number of physical CDs they bought plummeted, the overall share of music they paid for fell to 42 percent from 48 percent.