Year	Percent
1975-01-01	60.51470000000000
1976-01-01	55.52200000000000
1977-01-01	54.11800000000000
1978-01-01	58.97560000000000
1979-01-01	66.31550000000000
1980-01-01	62.11950000000000
1981-01-01	70.03150000000000
1982-01-01	84.06700000000001
1983-01-01	88.53340000000000
1984-01-01	71.40400000000000
1985-01-01	66.21100000000000
1986-01-01	95.95470000000000
1987-01-01	118.87700000000001
1988-01-01	107.76000000000000
1989-01-01	101.24300000000000
1990-01-01	108.26799999999999
1991-01-01	125.36800000000000
1992-01-01	129.42300000000000
1993-01-01	134.92600000000002
1994-01-01	164.74000000000000
1995-01-01	172.55700000000002
1996-01-01	161.68600000000000
1997-01-01	150.96400000000000
1998-01-01	131.90100000000000
1999-01-01	150.68000000000000
2000-01-01	160.55100000000002
2001-01-01	129.62700000000000
2002-01-01	130.99900000000000
2003-01-01	148.52700000000002
2004-01-01	163.69299999999998
2005-01-01	194.05500000000000
2006-01-01	225.37400000000002
2007-01-01	252.19000000000000
2008-01-01	212.75000000000000
2009-01-01	214.84200000000000
2010-01-01	247.27200000000002
2011-01-01	208.80000000000000
2012-01-01	202.62300000000000
2013-01-01	234.76900000000000
2014-01-01	256.03700000000003
2015-01-01	242.88600000000000
2016-01-01	270.19700000000000
2017-01-01	328.08000000000000