Year	Percent
1960-01-01	91.355900000000000
1961-01-01	94.894800000000000
1962-01-01	96.060200000000000
1963-01-01	102.529000000000000
1964-01-01	116.402999999999990
1965-01-01	122.577999999999990
1966-01-01	118.008000000000000
1967-01-01	111.907999999999990
1968-01-01	107.980000000000000
1969-01-01	104.767999999999990
1970-01-01	106.091000000000010
1971-01-01	109.402000000000000
1972-01-01	116.576000000000010
1973-01-01	123.923999999999990
1974-01-01	143.405000000000000
1975-01-01	164.382000000000000
1976-01-01	157.555000000000000
1977-01-01	143.966000000000000
1978-01-01	139.225000000000000
1979-01-01	150.197000000000000
1980-01-01	159.576000000000000
1981-01-01	160.197000000000000
1982-01-01	157.813000000000000
1983-01-01	141.559000000000000
1984-01-01	119.241000000000000
1985-01-01	94.570600000000000
1986-01-01	76.803000000000000
1987-01-01	71.147300000000000
1988-01-01	71.161700000000000
1989-01-01	67.109900000000000
1990-01-01	67.255600000000000
1991-01-01	65.533600000000000
1992-01-01	65.350400000000000
1993-01-01	71.200000000000000
1994-01-01	73.717300000000000
1995-01-01	79.967300000000000
1996-01-01	94.196100000000000
1997-01-01	102.107999999999990
1998-01-01	94.839300000000000
1999-01-01	81.081400000000000
2000-01-01	73.960300000000000
2001-01-01	70.063300000000000
2002-01-01	64.972300000000000
2003-01-01	61.615600000000000
2004-01-01	60.388000000000005
2005-01-01	57.592000000000000
2006-01-01	52.378600000000000
2007-01-01	50.403900000000000
2008-01-01	53.516000000000005
2009-01-01	54.569300000000000
2010-01-01	54.424700000000000
2011-01-01	58.109200000000000
2012-01-01	62.971500000000000
2013-01-01	60.884700000000000
2014-01-01	59.778000000000000
2015-01-01	62.780500000000000
2016-01-01	64.552900000000000