According to data from Nielsen SoundScan, U.S. sales of digital music albums grew by 60% to 23.5 million units in the first six months of 2007 but failed to offset the rapid sales decline of compact discs: total album sales were down by 15% for both digital and CDs, with CDs alone falling 19.3% to 205.7 million units. The recorded music industry is struggling in the early stages of a transition to digital formats from the dominant CD format. The biggest selling albums in the first half of the year were Daughtry"s self-titled work with 1.7 million units, Norah Jones" "Not Too Late" at 1.4 million units and Akon"s "Konvicted" at 1.3 million.