Year	Percent
1994-01-01	37.40
1995-01-01	38.47
1996-01-01	32.18
1997-01-01	32.45
1998-01-01	51.62
1999-01-01	39.10
2000-01-01	58.84
2001-01-01	59.90
2002-01-01	57.26
2003-01-01	62.36
2004-01-01	65.66
2005-01-01	72.20
2006-01-01	81.19
2007-01-01	77.65
2008-01-01	67.60
2009-01-01	77.04
2010-01-01	74.05
2011-01-01	64.40
2012-01-01	67.06
2013-01-01	66.19
2014-01-01	67.71
2015-01-01	70.18
2016-01-01	74.24