According to Nielsen SoundScan’s mid-year report, album sales (CD + digital) have dropped 3.2% during the first six months of 2012 to 150.5 million units from 155.5 million a year ago. CD sales declined 15.1% in the second quarter of 2012 to 42.6 million units, compared to 51.4 million a year ago. Meanwhile, according to Nielsen, digital album sales have seen a jump of 13.8% to 57.2 million units in the first six months of 2012, from 50.3 million a year ago. The growth of individual track download sales has slowed during the first six months of 2012 compared to 2011, growing only 5.6% to 698 million. This is a considerable drop from the 10.6% increase during the first half of 2011, which saw scans of 660.8 million from 597.4 million units during the first six months of 2010. At the mid-way point in 2012, Adele’s “21″ and Gotye’s “Somebody That I Used to Know” (featuring Kimbra), rule as the year’s biggest selling album and digital song in the U.S., respectively — selling 3.69 million and 5.50 million according to Nielsen SoundScan. But reflecting the slighter softer year for digital track sales, only 15 titles sold more than 2 million units and 47, including those 15, tallied more than 1 million units in the first half of the year, versus 2011 when 17 titles passed the 2 million units milestone and 52 titles in total hit the 1 million unit mark.