Year	Percent
1979-01-01	140.29900000000000
1980-01-01	162.90500000000000
1981-01-01	210.99599999999998
1982-01-01	145.85299999999998
1983-01-01	75.84340000000000
1984-01-01	71.54960000000000
1985-01-01	60.97240000000000
1986-01-01	73.41400000000000
1987-01-01	82.92940000000000
1988-01-01	83.78990000000000
1989-01-01	100.04100000000000
1990-01-01	98.68650000000000
1991-01-01	94.75390000000000
1992-01-01	95.25010000000000
1993-01-01	149.24100000000000
1994-01-01	186.80400000000000
1995-01-01	166.84300000000000
1996-01-01	155.34600000000000
1997-01-01	123.72900000000000
1998-01-01	109.14399999999999
1999-01-01	166.16099999999997
2000-01-01	179.06500000000000
2001-01-01	147.55300000000000
2002-01-01	118.18799999999999
2003-01-01	130.15000000000000
2004-01-01	163.04700000000000
2005-01-01	187.14000000000000
2006-01-01	220.39300000000000
2007-01-01	260.40800000000000
2008-01-01	223.68300000000000
2009-01-01	191.59300000000000
2010-01-01	246.08100000000000
2011-01-01	237.68900000000002
2012-01-01	235.42400000000000
2013-01-01	247.28500000000000
2014-01-01	239.09000000000000
2015-01-01	219.17500000000000
2016-01-01	205.46700000000000
2017-01-01	220.30700000000002