Year	Percent
2000-01-01	9.11368924660634
2001-01-01	10.29603977657970
2002-01-01	11.05364334008740
2003-01-01	10.73666477105880
2004-01-01	10.38002670689370
2005-01-01	9.74315720475288
2006-01-01	6.25990944097669
2007-01-01	4.34173380665376
2008-01-01	3.25803871250706
2009-01-01	3.79371936944392
2010-01-01	4.51065248958312
2011-01-01	4.53180098371085
2012-01-01	4.77795766953362
2013-01-01	4.89962400245448