Year	Percent
1981-01-01	59.66040000000000
1982-01-01	54.36790000000000
1983-01-01	60.11340000000000
1984-01-01	62.45280000000000
1985-01-01	68.09890000000000
1986-01-01	68.64270000000000
1987-01-01	51.88010000000000
1988-01-01	57.32430000000000
1989-01-01	79.37600000000000
1990-01-01	99.05020000000000
1991-01-01	105.67600000000000
1992-01-01	126.98500000000000
1993-01-01	224.45100000000000
1994-01-01	265.56400000000000
1995-01-01	229.30300000000000
1996-01-01	257.68200000000000
1997-01-01	184.48900000000000
1998-01-01	113.35400000000000
1999-01-01	150.44899999999998
2000-01-01	134.60399999999998
2001-01-01	124.96799999999999
2002-01-01	121.67800000000000
2003-01-01	130.33300000000000
2004-01-01	137.35399999999998
2005-01-01	126.47900000000000
2006-01-01	130.15000000000000
2007-01-01	148.53600000000000
2008-01-01	116.41400000000000
2009-01-01	115.30700000000000
2010-01-01	141.80000000000000
2011-01-01	139.36300000000000
2012-01-01	136.52200000000002
2013-01-01	147.95300000000000
2014-01-01	139.37400000000000
2015-01-01	128.94200000000000
2016-01-01	120.75500000000000
2017-01-01	128.15900000000000