Year Number 2005-01-01 18.36342099 2006-01-01 25.70754228 2007-01-01 32.08655058 2008-01-01 37.19772725 2009-01-01 39.74519405 2010-01-01 52.65894930 2011-01-01 49.94701185 2012-01-01 51.62324483