Year	Percent
1991-01-01	94.4897
1992-01-01	92.8881
1993-01-01	91.2575
1994-01-01	91.3559
1995-01-01	88.2659
1996-01-01	83.2118
1997-01-01	77.6829
1998-01-01	70.0071
1999-01-01	67.5061
2000-01-01	64.2764
2001-01-01	67.7092
2002-01-01	76.4789
2003-01-01	83.3924
2004-01-01	88.2398
2005-01-01	92.6841
2006-01-01	96.3933
2007-01-01	98.9693
2008-01-01	99.8310
2009-01-01	99.8579
2010-01-01	99.8686
2011-01-01	99.8752
2012-01-01	99.8805
2013-01-01	99.8835
2014-01-01	99.8819
2015-01-01	99.8800
2016-01-01	99.8823