Year Number 2008-01-01 541.3142 2009-01-01 558.2235 2010-01-01 579.6388 2011-01-01 587.6580 2012-01-01 592.7238 2013-01-01 620.2050 2014-01-01 652.3024 2015-01-01 690.9155 2016-01-01 687.7486