Year	Number
2004-01-01	5.754734326
2005-01-01	5.423791138
2006-01-01	6.490163633
2007-01-01	7.961022247
2008-01-01	10.590182020
2009-01-01	9.891524177
2010-01-01	10.479867620
2011-01-01	10.167310170
2012-01-01	10.755653610
2013-01-01	11.454311450
2014-01-01	9.321566464