Year	Percent
1960-01-01	9.995190000000000
1961-01-01	10.015500000000000
1962-01-01	9.946100000000000
1963-01-01	10.256600000000000
1964-01-01	10.681800000000000
1965-01-01	11.910800000000000
1966-01-01	13.862000000000000
1967-01-01	16.265500000000000
1968-01-01	17.886700000000000
1969-01-01	20.011400000000000
1970-01-01	14.363500000000000
1971-01-01	15.282500000000000
1972-01-01	15.170300000000000
1973-01-01	16.046000000000000
1974-01-01	17.420000000000000
1975-01-01	19.200200000000000
1976-01-01	19.541400000000000
1977-01-01	20.314700000000000
1978-01-01	21.017300000000000
1979-01-01	20.853100000000000
1980-01-01	20.663400000000000
1981-01-01	20.164500000000000
1982-01-01	21.455500000000000
1983-01-01	22.504400000000000
1984-01-01	22.814000000000000
1985-01-01	22.999700000000000
1986-01-01	24.386000000000000
1987-01-01	24.842200000000000
1988-01-01	24.393000000000000
1989-01-01	23.468400000000000
1990-01-01	21.471300000000000
1991-01-01	19.071700000000000
1992-01-01	18.605100000000000
1993-01-01	18.551100000000000
1994-01-01	17.604500000000000
1995-01-01	16.884100000000000
1996-01-01	17.627700000000000
1997-01-01	21.648600000000000
1998-01-01	27.214400000000000
1999-01-01	31.779700000000000
2000-01-01	32.216900000000000
2001-01-01	33.815900000000000
2002-01-01	34.658500000000000
2003-01-01	34.546600000000000
2004-01-01	34.955200000000000
2005-01-01	35.974000000000004
2006-01-01	39.186000000000000
2007-01-01	45.181300000000000
2008-01-01	49.384200000000000
2009-01-01	49.745600000000000
2010-01-01	47.078800000000000
2011-01-01	45.096100000000000
2012-01-01	47.446900000000000
2013-01-01	51.871200000000000
2014-01-01	52.627100000000000
2015-01-01	52.299600000000000
2016-01-01	53.729900000000000