Year	Percent
1975-01-01	20.11860000000000
1976-01-01	21.86650000000000
1977-01-01	19.13640000000000
1978-01-01	26.47260000000000
1979-01-01	29.17660000000000
1980-01-01	34.64880000000000
1981-01-01	31.31080000000000
1982-01-01	37.11440000000000
1983-01-01	48.81970000000000
1984-01-01	64.52240000000000
1985-01-01	75.30260000000000
1986-01-01	90.43750000000000
1987-01-01	112.76600000000000
1988-01-01	73.83850000000000
1989-01-01	75.71860000000000
1990-01-01	62.28350000000000
1991-01-01	58.97470000000000
1992-01-01	57.98720000000000
1993-01-01	69.87220000000000
1994-01-01	69.99630000000000
1995-01-01	85.37650000000000
1996-01-01	89.93150000000000
1997-01-01	96.01190000000000
1998-01-01	103.68200000000000
1999-01-01	135.56300000000000
2000-01-01	198.07600000000000
2001-01-01	142.12900000000000
2002-01-01	135.19700000000000
2003-01-01	125.93700000000001
2004-01-01	123.95299999999999
2005-01-01	153.42200000000000
2006-01-01	165.47000000000000
2007-01-01	215.48500000000000
2008-01-01	292.61500000000000
2009-01-01	255.95500000000000
2010-01-01	222.24700000000000
2011-01-01	246.31599999999997
2012-01-01	187.09799999999998
2013-01-01	154.75900000000000
2014-01-01	152.96500000000000
2015-01-01	160.15700000000000
2016-01-01	159.88400000000000
2017-01-01	133.26900000000000