Year	Percent
1960-01-01	38.88550000000000
1961-01-01	37.09090000000000
1962-01-01	35.45470000000000
1963-01-01	37.01610000000000
1964-01-01	41.96660000000000
1965-01-01	34.91650000000000
1966-01-01	36.22410000000000
1967-01-01	35.60270000000000
1968-01-01	41.38390000000000
1969-01-01	41.61400000000000
1970-01-01	43.14450000000000
1971-01-01	41.19770000000000
1972-01-01	42.49660000000000
1973-01-01	47.37890000000000
1974-01-01	63.03310000000000
1975-01-01	79.15910000000000
1976-01-01	65.52510000000000
1977-01-01	61.42850000000000
1978-01-01	62.05090000000000
1979-01-01	59.54350000000000
1980-01-01	58.49630000000000
1981-01-01	57.01850000000000
1982-01-01	55.38180000000000
1983-01-01	56.95960000000000
1984-01-01	54.06510000000000
1985-01-01	55.65290000000000
1986-01-01	57.56210000000000
1987-01-01	57.88210000000000
1988-01-01	71.73890000000000
1989-01-01	86.63400000000000
1990-01-01	91.20950000000000
1991-01-01	101.14200000000001
1992-01-01	102.03600000000000
1993-01-01	111.24900000000000
1994-01-01	113.26500000000000
1995-01-01	104.79899999999999
1996-01-01	116.55000000000000
1997-01-01	125.04100000000000
1998-01-01	128.45000000000000
1999-01-01	136.08500000000000
2000-01-01	143.41700000000000
2001-01-01	145.63900000000000
2002-01-01	83.51670000000000
2003-01-01	83.83300000000000
2004-01-01	82.48330000000000
2005-01-01	116.72900000000000
2006-01-01	152.84700000000000
2007-01-01	162.69200000000000
2008-01-01	211.14200000000000
2009-01-01	218.60900000000000
2010-01-01	226.12200000000000
2011-01-01	237.16299999999998
2012-01-01	247.86900000000003
2013-01-01	260.70400000000000
2014-01-01	257.28200000000000
2015-01-01	247.98200000000000