Year	Percent
1967-01-01	91.57130000000000
1968-01-01	85.31640000000000
1969-01-01	88.40600000000000
1970-01-01	95.29290000000000
1971-01-01	97.30780000000000
1972-01-01	93.30450000000000
1973-01-01	94.19690000000000
1974-01-01	98.28220000000000
1975-01-01	98.41570000000000
1976-01-01	88.71030000000000
1977-01-01	76.22570000000000
1978-01-01	70.86820000000000
1979-01-01	68.79850000000000
1980-01-01	68.72760000000000
1981-01-01	64.97840000000000
1982-01-01	60.59900000000000
1983-01-01	59.41530000000000
1984-01-01	59.82710000000000
1985-01-01	63.35960000000000
1986-01-01	71.71640000000000
1987-01-01	85.78880000000000
1988-01-01	96.71190000000000
1989-01-01	99.99810000000000
1990-01-01	99.99790000000000
1991-01-01	93.44130000000000
1992-01-01	91.73140000000000
1993-01-01	96.72010000000000
1994-01-01	96.87799999999999
1995-01-01	97.75860000000000
1996-01-01	98.84590000000000
1997-01-01	98.12070000000000
1998-01-01	95.63310000000000
1999-01-01	95.54020000000000
2000-01-01	97.43200000000000
2001-01-01	97.68720000000000
2002-01-01	98.18410000000000
2003-01-01	99.04180000000000
2004-01-01	99.15000000000000
2005-01-01	98.44460000000000
2006-01-01	97.34540000000000
2007-01-01	98.02890000000000
2008-01-01	99.41090000000000
2009-01-01	99.61870000000000
2010-01-01	99.04720000000000
2011-01-01	97.87140000000000
2012-01-01	98.10740000000000
2013-01-01	98.61030000000000
2014-01-01	98.79740000000000
2015-01-01	99.23620000000000
2016-01-01	99.61410000000000