Year	Percent
1991-01-01	96.41890000000000
1992-01-01	96.27190000000000
1993-01-01	90.26880000000000
1994-01-01	80.41100000000000
1995-01-01	86.63799999999999
1996-01-01	78.94170000000000
1997-01-01	72.03760000000000
1998-01-01	80.93220000000000
1999-01-01	83.00170000000000
2000-01-01	84.67850000000000
2001-01-01	89.88120000000000
2002-01-01	97.08840000000000
2003-01-01	99.46440000000000
2004-01-01	91.69890000000000
2005-01-01	88.20500000000000
2006-01-01	94.03040000000000
2007-01-01	98.89190000000000
2008-01-01	98.89190000000000
2009-01-01	92.72100000000000
2010-01-01	88.98670000000000
2011-01-01	92.75830000000000
2012-01-01	95.80600000000000
2013-01-01	99.17480000000000
2014-01-01	98.14130000000000
2015-01-01	96.39010000000000
2016-01-01	94.32420000000000