Year	Percent
1983-01-01	35.45260000000000
1984-01-01	30.34610000000000
1985-01-01	28.68210000000000
1986-01-01	31.15740000000000
1987-01-01	19.51070000000000
1988-01-01	19.68880000000000
1989-01-01	12.94230000000000
1990-01-01	12.13560000000000
1991-01-01	13.49420000000000
1992-01-01	14.09120000000000
1993-01-01	16.61810000000000
1994-01-01	14.12260000000000
1995-01-01	15.96860000000000
1996-01-01	14.03460000000000
1997-01-01	40.03760000000000
1998-01-01	18.58080000000000
1999-01-01	205.77800000000000
2000-01-01	135.80500000000000
2001-01-01	92.33130000000000
2002-01-01	49.97040000000000
2003-01-01	215.37300000000000
2004-01-01	238.31500000000000
2005-01-01	226.61500000000000
2006-01-01	185.05599999999998
2007-01-01	247.25400000000002
2008-01-01	179.39500000000000
2009-01-01	218.07700000000000
2010-01-01	206.81300000000000
2011-01-01	195.80300000000000
2012-01-01	184.37400000000002
2013-01-01	193.40900000000002
2014-01-01	173.99500000000000
2015-01-01	195.70400000000000
2016-01-01	174.95500000000000