Year	Percent
1997-01-01	9.911200000000000
1998-01-01	9.610420000000000
1999-01-01	10.331400000000000
2000-01-01	9.332640000000000
2001-01-01	11.766300000000000
2002-01-01	15.088400000000000
2003-01-01	17.764100000000000
2004-01-01	19.462300000000000
2005-01-01	22.330300000000000
2006-01-01	26.866300000000000
2007-01-01	32.205300000000000
2008-01-01	35.080600000000000
2009-01-01	38.885100000000000
2010-01-01	41.773200000000000
2011-01-01	42.925100000000000
2012-01-01	43.910200000000000
2013-01-01	43.681800000000000
2014-01-01	46.251000000000005
2015-01-01	48.114700000000000