Year	Percent
1990-01-01	39.54
1991-01-01	41.90
1992-01-01	43.25
1993-01-01	49.65
1994-01-01	47.17
1995-01-01	52.52
1996-01-01	56.43
1997-01-01	56.69
1998-01-01	59.81
1999-01-01	64.55
2000-01-01	60.33
2001-01-01	56.43
2002-01-01	54.95
2003-01-01	62.72
2004-01-01	65.84
2005-01-01	66.47
2006-01-01	65.39
2007-01-01	71.52
2008-01-01	52.86
2009-01-01	73.22
2010-01-01	73.51
2011-01-01	68.95
2012-01-01	75.26
2013-01-01	75.64
2014-01-01	80.10
2015-01-01	84.22
2016-01-01	90.61