Year Number 2008-01-01 318.8459 2009-01-01 313.3976 2010-01-01 342.0554 2011-01-01 338.0276 2012-01-01 338.6014 2013-01-01 331.6983 2014-01-01 339.7813 2015-01-01 355.9263 2016-01-01 363.5248