Year Number 2007-01-01 466.7719 2008-01-01 514.1507 2009-01-01 568.8602 2010-01-01 606.9442 2011-01-01 710.0696 2012-01-01 861.8517 2013-01-01 1065.0016 2014-01-01 993.8174 2015-01-01 1249.3331 2016-01-01 912.6301 2017-01-01 980.1824