Year	Percent
1962-01-01	59.720100000000000
1963-01-01	52.211200000000000
1964-01-01	33.736400000000000
1965-01-01	23.545300000000000
1966-01-01	12.780800000000000
1967-01-01	6.783700000000000
1968-01-01	17.896800000000000
1969-01-01	33.872600000000000
1970-01-01	39.970100000000000
1971-01-01	42.018400000000000
1972-01-01	44.783800000000000
1973-01-01	47.881400000000000
1974-01-01	53.553999999999995
1975-01-01	60.037000000000000
1976-01-01	63.247100000000000
1977-01-01	58.783000000000000
1978-01-01	55.524800000000000
1979-01-01	58.009300000000000
1980-01-01	59.451900000000000
1981-01-01	59.612100000000000
1982-01-01	57.012200000000000
1983-01-01	53.723200000000000
1984-01-01	55.602700000000000
1985-01-01	61.713400000000000
1986-01-01	65.349300000000000
1987-01-01	67.701000000000010
1988-01-01	63.561100000000000
1989-01-01	63.024300000000000
1990-01-01	69.564800000000000
1991-01-01	72.050100000000000
1992-01-01	71.946900000000000
1993-01-01	71.104900000000000
1994-01-01	68.121200000000000
1995-01-01	67.857400000000000
1996-01-01	70.797600000000000
1997-01-01	69.989100000000000
1998-01-01	70.045500000000000
1999-01-01	72.093800000000000
2000-01-01	73.073300000000000
2001-01-01	74.298600000000000
2002-01-01	77.314900000000000
2003-01-01	81.344100000000000
2004-01-01	84.225000000000000
2005-01-01	86.599300000000000
2006-01-01	92.170700000000000
2007-01-01	96.913800000000000
2008-01-01	96.633000000000000
2009-01-01	93.733300000000000
2010-01-01	92.013700000000000
2011-01-01	92.182800000000000
2012-01-01	92.211900000000000
2013-01-01	92.562500000000000
2014-01-01	93.690600000000000
2015-01-01	95.003999999999990
2016-01-01	95.580900000000000