Year	Percent
1985-01-01	94.38700000000000
1986-01-01	94.14860000000000
1987-01-01	93.24100000000000
1988-01-01	92.56280000000000
1989-01-01	92.57160000000000
1990-01-01	92.77960000000000
1991-01-01	92.75350000000000
1992-01-01	92.71930000000000
1993-01-01	93.33510000000000
1994-01-01	94.11790000000000
1995-01-01	95.20500000000000
1996-01-01	96.29170000000000
1997-01-01	97.29670000000000
1998-01-01	98.05070000000000
1999-01-01	98.34660000000000
2000-01-01	98.51840000000000
2001-01-01	98.16160000000000
2002-01-01	97.93890000000000
2003-01-01	98.23390000000000
2004-01-01	98.46230000000000
2005-01-01	98.63850000000000
2006-01-01	98.81610000000000
2007-01-01	96.82260000000000
2008-01-01	95.35850000000000
2009-01-01	96.27770000000000
2010-01-01	97.07640000000000
2011-01-01	97.51960000000000
2012-01-01	97.84899999999999
2013-01-01	98.12790000000000
2014-01-01	98.35340000000000
2015-01-01	98.58090000000000
2016-01-01	98.78420000000000