Year Number 2007-01-01 63.0758560699991 2008-01-01 231.9200220965300 2009-01-01 394.4644819296930 2010-01-01 710.5906756096510 2011-01-01 806.1388030634530 2012-01-01 859.7648073769620 2013-01-01 1004.4762579495700 2014-01-01 972.4422696651290 2015-01-01 1182.8469400007100