Year Number 2008-01-01 345.6403 2009-01-01 337.2225 2010-01-01 321.7607 2011-01-01 337.5586 2012-01-01 355.0960 2013-01-01 402.2734 2014-01-01 402.5382 2015-01-01 386.7965 2016-01-01 382.5106