Year	Percent
2001-01-01	11.57
2002-01-01	14.08
2003-01-01	19.74
2004-01-01	23.38
2005-01-01	25.80
2006-01-01	30.34
2007-01-01	45.01
2008-01-01	43.42
2009-01-01	53.54
2010-01-01	54.02
2011-01-01	53.79