Year	Percent
1992-01-01	76.52650000000000
1993-01-01	74.48600000000000
1994-01-01	74.48600000000000
1995-01-01	90.58240000000000
1996-01-01	88.72830000000000
1997-01-01	87.78520000000000
1998-01-01	87.51740000000000
1999-01-01	89.46600000000001
2000-01-01	92.48150000000000
2001-01-01	93.76560000000000
2002-01-01	94.20520000000000
2003-01-01	95.01360000000000
2004-01-01	95.63920000000000
2005-01-01	96.59260000000000
2006-01-01	97.32900000000000
2007-01-01	98.22510000000000
2008-01-01	99.03930000000000
2009-01-01	97.58300000000000
2010-01-01	96.73080000000000
2011-01-01	97.62360000000000
2012-01-01	98.50940000000000
2013-01-01	99.04520000000000
2014-01-01	99.54420000000000
2015-01-01	99.08930000000000
2016-01-01	99.04799999999999