Year Number 2007-01-01 8.717994291 2008-01-01 21.410326280 2009-01-01 28.471351680 2010-01-01 38.360653340 2011-01-01 61.777989890 2012-01-01 88.589197080 2013-01-01 77.357805980 2014-01-01 113.648669400