Year	Percent
1960-01-01	101.390000000000000
1961-01-01	96.242300000000000
1962-01-01	92.265600000000000
1963-01-01	91.098200000000000
1964-01-01	87.576000000000010
1965-01-01	84.743500000000000
1966-01-01	81.501400000000000
1967-01-01	75.278300000000000
1968-01-01	73.554300000000000
1969-01-01	77.137100000000000
1970-01-01	75.660300000000000
1971-01-01	75.859300000000000
1972-01-01	73.460200000000000
1973-01-01	60.823100000000000
1974-01-01	55.172200000000000
1975-01-01	62.854900000000000
1976-01-01	68.880300000000000
1977-01-01	66.768500000000000
1978-01-01	61.981100000000000
1979-01-01	58.059600000000000
1980-01-01	45.444800000000000
1981-01-01	42.788300000000000
1982-01-01	47.688700000000000
1983-01-01	47.042500000000000
1984-01-01	46.368400000000000
1985-01-01	46.481400000000000
1986-01-01	47.138000000000005
1987-01-01	45.372500000000000
1988-01-01	42.306999999999995
1989-01-01	40.399800000000000
1990-01-01	37.928800000000000
1991-01-01	33.219600000000000
1992-01-01	30.375600000000000
1993-01-01	31.629000000000000
1994-01-01	35.645100000000000
1995-01-01	43.470700000000000
1996-01-01	51.444800000000000
1997-01-01	58.426900000000000
1998-01-01	67.946600000000000
1999-01-01	77.840400000000000
2000-01-01	81.054400000000000
2001-01-01	79.236200000000000
2002-01-01	75.626900000000000
2003-01-01	68.931900000000000
2004-01-01	64.621600000000000
2005-01-01	62.311800000000000
2006-01-01	59.718100000000000
2007-01-01	56.616000000000010
2008-01-01	55.610000000000000
2009-01-01	53.773999999999994
2010-01-01	49.444600000000000
2011-01-01	48.779300000000000
2012-01-01	48.575500000000000
2013-01-01	45.229400000000000
2014-01-01	41.946000000000005
2015-01-01	40.590900000000000
2016-01-01	40.417000000000000