Year Number 2008-01-01 20.1893 2009-01-01 25.8924 2010-01-01 31.6297 2011-01-01 32.6821 2012-01-01 34.3841 2013-01-01 63.4639 2014-01-01 76.2939 2015-01-01 87.2050 2016-01-01 43.2532