Year	Percent
1960-01-01	50.100600000000000
1961-01-01	50.576200000000000
1962-01-01	53.273700000000000
1963-01-01	58.051200000000000
1964-01-01	61.858999999999995
1965-01-01	62.549900000000000
1966-01-01	63.805100000000000
1967-01-01	66.864500000000000
1968-01-01	68.693900000000000
1969-01-01	61.615300000000000
1970-01-01	57.480700000000000
1971-01-01	58.137900000000000
1972-01-01	58.382900000000000
1973-01-01	59.563300000000000
1974-01-01	60.767300000000000
1975-01-01	62.748300000000000
1976-01-01	63.756500000000000
1977-01-01	66.635500000000000
1978-01-01	70.550900000000000
1979-01-01	75.030600000000000
1980-01-01	80.717000000000000
1981-01-01	81.920400000000000
1982-01-01	78.422900000000000
1983-01-01	74.535400000000000
1984-01-01	74.019600000000000
1985-01-01	73.496500000000000
1986-01-01	71.089900000000000
1987-01-01	70.655900000000000
1988-01-01	75.268200000000000
1989-01-01	84.355400000000000
1990-01-01	89.087200000000000
1991-01-01	90.587400000000000
1992-01-01	104.274000000000000
1993-01-01	107.072000000000000
1994-01-01	102.935000000000000
1995-01-01	101.459000000000000
1996-01-01	97.854200000000000
1997-01-01	95.012000000000000
1998-01-01	95.012000000000000
1999-01-01	92.396400000000000
2000-01-01	94.578500000000000
2001-01-01	81.739400000000000
2002-01-01	79.546300000000000
2003-01-01	74.395700000000000
2004-01-01	69.590300000000000
2005-01-01	67.723400000000000
2006-01-01	68.574500000000000
2007-01-01	71.697000000000000
2008-01-01	70.693000000000000
2009-01-01	63.858000000000004
2010-01-01	59.009100000000000
2011-01-01	57.138900000000000
2012-01-01	55.526900000000000
2013-01-01	54.577900000000000
2014-01-01	54.477800000000000
2015-01-01	54.710600000000000
2016-01-01	56.076700000000000