Year	Percent
1963-01-01	93.49220000000000
1964-01-01	91.89140000000000
1965-01-01	91.59960000000000
1966-01-01	92.23490000000000
1967-01-01	94.05490000000000
1968-01-01	94.95110000000000
1969-01-01	95.59260000000000
1970-01-01	94.59480000000000
1971-01-01	93.69310000000000
1972-01-01	94.00790000000000
1973-01-01	93.73000000000000
1974-01-01	87.56560000000000
1975-01-01	82.02100000000000
1976-01-01	80.05550000000000
1977-01-01	81.31360000000000
1978-01-01	83.88910000000000
1979-01-01	84.83170000000000
1980-01-01	84.95100000000001
1981-01-01	83.61150000000000
1982-01-01	83.06840000000000
1983-01-01	83.65770000000000
1984-01-01	84.50020000000000
1985-01-01	84.08090000000000
1986-01-01	83.42830000000000
1987-01-01	83.27880000000000
1988-01-01	83.65810000000000
1989-01-01	85.00890000000000
1990-01-01	86.54000000000000
1991-01-01	88.22430000000000
1992-01-01	88.99270000000000
1993-01-01	88.82290000000000
1994-01-01	88.28100000000000
1995-01-01	87.85780000000000
1996-01-01	88.88260000000000
1997-01-01	89.83270000000000
1998-01-01	90.48050000000000
1999-01-01	93.86110000000000
2000-01-01	93.92990000000000
2001-01-01	93.57070000000000
2002-01-01	94.61750000000000
2003-01-01	95.43810000000000
2004-01-01	95.01940000000000
2005-01-01	94.74540000000000
2006-01-01	94.82200000000000
2007-01-01	95.58600000000000
2008-01-01	96.28670000000000
2009-01-01	96.38610000000000
2010-01-01	96.42610000000000
2011-01-01	96.25620000000000
2012-01-01	95.64940000000000
2013-01-01	95.19830000000000
2014-01-01	94.78550000000000
2015-01-01	92.90280000000000
2016-01-01	89.06190000000000