Year	Percent
1996-01-01	58.0430
1997-01-01	55.2679
1998-01-01	50.3596
1999-01-01	47.6852
2000-01-01	51.5857
2001-01-01	51.3859
2002-01-01	58.9592
2003-01-01	71.7312
2004-01-01	64.0960
2005-01-01	64.0111
2006-01-01	58.5994
2007-01-01	54.8657
2008-01-01	50.3896
2009-01-01	52.2116
2010-01-01	57.9093
2011-01-01	57.5762
2012-01-01	55.0459
2013-01-01	55.8439
2014-01-01	56.7674