Year	Percent
1980-01-01	4.2500000000000000
1981-01-01	4.4000000000000000
1982-01-01	4.2500000000000000
1983-01-01	2.0416700000000000
1984-01-01	2.5100000000000000
1985-01-01	2.0541700000000000
1986-01-01	0.8458330000000000
1987-01-01	2.3416700000000000
1988-01-01	3.4058300000000004
1989-01-01	6.3983300000000005
1990-01-01	6.8525000000000000
1991-01-01	5.1058300000000000
1992-01-01	6.6800000000000000
1993-01-01	6.2550000000000000
1994-01-01	4.0733300000000000
1995-01-01	6.0100000000000000
1996-01-01	6.2500000000000000
1997-01-01	5.5800000000000000
1998-01-01	11.4200000000000000
1999-01-01	10.1800000000000000
2000-01-01	10.6800000000000000
2001-01-01	10.5100000000000000
2002-01-01	8.9600000000000000
2003-01-01	10.5700000000000000
2004-01-01	11.1400000000000000
2005-01-01	9.9600000000000000
2006-01-01	9.1600000000000000
2007-01-01	7.6700000000000000
2008-01-01	7.1700000000000000
2009-01-01	8.1400000000000000
2010-01-01	9.6200000000000000
2011-01-01	9.9000000000000000
2012-01-01	10.2700000000000000
2013-01-01	9.5200000000000000
2014-01-01	8.6600000000000000
2015-01-01	7.8700000000000000
2016-01-01	8.1900000000000000