Year	Percent
1980-01-01	0.7710840000000000
1981-01-01	1.1787400000000000
1982-01-01	1.2411600000000000
1983-01-01	1.2316799999999999
1984-01-01	1.0101200000000001
1985-01-01	1.0101200000000001
1986-01-01	1.0101200000000001
1987-01-01	1.0101200000000001
1988-01-01	1.0101200000000001
1989-01-01	1.0101200000000001
1990-01-01	1.0101200000000001
1991-01-01	1.0101200000000001
1992-01-01	1.0101200000000001
1993-01-01	1.0101200000000001
1994-01-01	5.0656700000000000
1995-01-01	4.5562000000000000
1996-01-01	4.1984500000000000
1997-01-01	3.7141000000000000
1998-01-01	1.4008600000000000
1999-01-01	3.3568000000000000
2000-01-01	4.8141700000000000
2001-01-01	6.0439200000000000
2002-01-01	7.2498500000000000
2003-01-01	8.3182600000000000
2004-01-01	8.9418400000000000
2005-01-01	8.2836600000000010
2006-01-01	7.4494500000000000
2007-01-01	6.2127700000000000
2008-01-01	4.7871000000000000
2009-01-01	4.0080300000000010
2010-01-01	3.2816000000000000
2011-01-01	2.3177900000000000
2012-01-01	3.6875199999999997
2013-01-01	4.9951000000000000
2014-01-01	6.3399900000000000
2015-01-01	7.7824399999999990
2016-01-01	7.3730600000000010