Year Number 2006-01-01 9.5668 2007-01-01 11.9145 2008-01-01 15.4864 2009-01-01 19.6989 2010-01-01 24.6676 2011-01-01 30.1746 2012-01-01 37.3601 2013-01-01 46.5242 2014-01-01 54.7506 2015-01-01 76.7876 2016-01-01 81.4515