Year Number 2008-01-01 755.3696 2009-01-01 752.4317 2010-01-01 742.7630 2011-01-01 706.9950 2012-01-01 664.9166 2013-01-01 664.3729 2014-01-01 594.0561 2015-01-01 547.2464 2016-01-01 523.3232