Year	Percent
1975-01-01	20.776800000000000
1976-01-01	20.276100000000000
1977-01-01	21.267800000000000
1978-01-01	23.546999999999997
1979-01-01	17.178200000000000
1980-01-01	18.501400000000000
1981-01-01	22.621400000000000
1982-01-01	23.190300000000000
1983-01-01	41.634900000000000
1984-01-01	35.174100000000000
1985-01-01	67.268000000000000
1986-01-01	60.741200000000000
1987-01-01	159.529000000000000
1988-01-01	145.376000000000000
1989-01-01	115.912000000000000
1990-01-01	138.452000000000000
1991-01-01	99.205400000000000
1992-01-01	118.120000000000000
1993-01-01	139.523000000000000
1994-01-01	126.501000000000000
1995-01-01	101.197000000000000
1996-01-01	24.610600000000000
1997-01-01	140.565000000000000
1998-01-01	153.793999999999980
1999-01-01	105.602000000000000
2000-01-01	145.945000000000000
2001-01-01	112.805000000000000
2002-01-01	95.989200000000000
2003-01-01	107.119000000000000
2004-01-01	99.260300000000000
2005-01-01	107.747000000000010
2006-01-01	137.227999999999980
2007-01-01	167.669000000000000
2008-01-01	247.783000000000000
2009-01-01	152.955000000000000
2010-01-01	112.646000000000000
2011-01-01	116.870000000000000
2012-01-01	96.836600000000000
2013-01-01	75.716600000000000
2014-01-01	69.068600000000000
2015-01-01	91.143200000000000
2016-01-01	65.893400000000000
2017-01-01	78.106300000000000