Year	Percent
1960-01-01	615.47000000000000
1961-01-01	498.67500000000000
1962-01-01	355.90100000000000
1963-01-01	312.16200000000003
1964-01-01	255.71400000000003
1965-01-01	196.71099999999998
1966-01-01	186.29400000000000
1967-01-01	192.05599999999998
1968-01-01	183.71599999999998
1969-01-01	144.37300000000000
1970-01-01	138.49200000000002
1971-01-01	127.33800000000000
1972-01-01	111.35300000000000
1973-01-01	121.48500000000000
1974-01-01	131.35900000000000
1975-01-01	116.45000000000000
1976-01-01	93.46230000000000
1977-01-01	78.39860000000000
1978-01-01	84.36980000000000
1979-01-01	98.67770000000000
1980-01-01	96.08310000000000
1981-01-01	78.88970000000000
1982-01-01	56.54450000000000
1983-01-01	56.54450000000000
1984-01-01	45.20950000000000
1985-01-01	60.32840000000000
1986-01-01	61.86570000000000
1987-01-01	67.63180000000000
1988-01-01	69.40880000000000
1989-01-01	67.80340000000000
1990-01-01	59.72640000000000
1991-01-01	59.72640000000000
1992-01-01	59.72640000000000
1993-01-01	59.72640000000000
1994-01-01	59.72640000000000
1995-01-01	59.72640000000000
1996-01-01	59.72640000000000
1997-01-01	59.72640000000000
1998-01-01	59.72640000000000
1999-01-01	59.72640000000000
2000-01-01	59.72640000000000
2001-01-01	59.72640000000000
2002-01-01	59.72640000000000
2003-01-01	59.72640000000000
2004-01-01	59.72640000000000
2005-01-01	59.72640000000000
2006-01-01	52.90560000000000
2007-01-01	56.81040000000000
2008-01-01	59.87450000000000
2009-01-01	58.23790000000000
2010-01-01	59.41100000000000
2011-01-01	42.88600000000000
2012-01-01	24.49610000000000
2013-01-01	23.31830000000000
2014-01-01	22.60070000000000
2015-01-01	21.82670000000000
2016-01-01	20.96100000000000