Year	Percent
1979-01-01	94.56490000000000
1980-01-01	95.30320000000000
1981-01-01	96.49260000000000
1982-01-01	96.19100000000000
1983-01-01	95.74350000000000
1984-01-01	93.69290000000000
1985-01-01	91.81870000000000
1986-01-01	92.35200000000000
1987-01-01	92.03590000000000
1988-01-01	92.83010000000000
1989-01-01	95.41280000000000
1990-01-01	96.16530000000000
1991-01-01	96.04210000000000
1992-01-01	97.35880000000000
1993-01-01	98.25750000000000
1994-01-01	98.67840000000000
1995-01-01	99.18010000000000
1996-01-01	99.35440000000000
1997-01-01	99.48760000000000
1998-01-01	99.62920000000000
1999-01-01	99.69660000000000
2000-01-01	99.61260000000000
2001-01-01	99.50690000000000
2002-01-01	99.43850000000000
2003-01-01	99.51799999999999
2004-01-01	99.56310000000000
2005-01-01	99.52860000000000
2006-01-01	99.56880000000000
2007-01-01	99.56920000000000
2008-01-01	99.58080000000000
2009-01-01	99.25040000000000
2010-01-01	98.98040000000000
2011-01-01	99.00060000000000
2012-01-01	99.39190000000000
2013-01-01	99.82320000000000
2014-01-01	99.82460000000000
2015-01-01	99.84890000000000
2016-01-01	99.92550000000000