Year	Percent
1995-01-01	33.66
1996-01-01	36.79
1997-01-01	41.94
1998-01-01	45.13
1999-01-01	51.75
2000-01-01	52.47
2001-01-01	53.48
2002-01-01	53.80
2003-01-01	57.72
2004-01-01	58.11
2005-01-01	59.63
2006-01-01	58.60
2007-01-01	57.44
2008-01-01	54.28
2009-01-01	46.76
2010-01-01	46.42
2011-01-01	45.13
2012-01-01	46.28
2013-01-01	47.28
2014-01-01	47.61
2015-01-01	47.82