Year	Percent
1960-01-01	84.96770000000000
1961-01-01	85.60100000000000
1962-01-01	87.78600000000000
1963-01-01	89.52860000000000
1964-01-01	90.39970000000000
1965-01-01	90.94920000000000
1966-01-01	90.43350000000000
1967-01-01	90.30700000000000
1968-01-01	90.39110000000000
1969-01-01	89.88230000000000
1970-01-01	89.06380000000000
1971-01-01	88.46320000000000
1972-01-01	89.26370000000000
1973-01-01	91.42970000000000
1974-01-01	90.31180000000000
1975-01-01	88.79820000000000
1976-01-01	89.52940000000000
1977-01-01	90.57090000000000
1978-01-01	91.20600000000000
1979-01-01	88.86330000000000
1980-01-01	88.13370000000000
1981-01-01	88.63450000000000
1982-01-01	87.78390000000000
1983-01-01	89.39470000000000
1984-01-01	88.90890000000000
1985-01-01	86.55580000000000
1986-01-01	85.59899999999999
1987-01-01	85.20030000000000
1988-01-01	87.01930000000000
1989-01-01	89.46250000000000
1990-01-01	92.37140000000000
1991-01-01	90.77900000000000
1992-01-01	86.40299999999999
1993-01-01	87.13970000000000
1994-01-01	89.43840000000000
1995-01-01	90.71330000000000
1996-01-01	92.21910000000000
1997-01-01	93.57070000000000
1998-01-01	95.53270000000000
1999-01-01	96.99560000000000
2000-01-01	97.75850000000000
2001-01-01	99.42550000000000
2002-01-01	99.98800000000000
2003-01-01	99.99390000000000
2004-01-01	99.99900000000000
2005-01-01	99.99890000000000
2006-01-01	99.99799999999999
2007-01-01	99.99910000000000
2008-01-01	99.99910000000000
2009-01-01	99.99910000000000
2010-01-01	99.99910000000000
2011-01-01	99.99910000000000
2012-01-01	99.96820000000000
2013-01-01	99.87310000000000
2014-01-01	99.80000000000000
2015-01-01	98.43810000000000
2016-01-01	96.15200000000000