Year	Percent
1981-01-01	5.375000000000000
1982-01-01	5.250000000000000
1983-01-01	6.041670000000000
1984-01-01	7.683330000000001
1985-01-01	9.250000000000000
1986-01-01	6.000000000000000
1987-01-01	4.000000000000000
1988-01-01	5.000000000000000
1989-01-01	7.000000000000000
1990-01-01	7.000000000000000
1991-01-01	7.000000000000000
1992-01-01	8.200000000000000
1993-01-01	12.500000000000000
1994-01-01	4.500000000000000
1995-01-01	2.900000000000000
1996-01-01	7.200000000000000
1997-01-01	6.600000000000000
1998-01-01	10.850000000000000
1999-01-01	11.500000000000000
2000-01-01	12.500000000000000
2001-01-01	11.830000000000000
2002-01-01	11.920000000000000
2003-01-01	8.100000000000000
2004-01-01	8.020000000000000
2005-01-01	7.250000000000000
2006-01-01	7.250000000000000
2007-01-01	8.170000000000000
2008-01-01	8.730000000000000
2009-01-01	7.570000000000000
2010-01-01	7.650000000000000
2011-01-01	7.650000000000000
2012-01-01	7.070000000000000
2013-01-01	7.070000000000000
2014-01-01	7.590000000000000
2015-01-01	9.900000000000000
2016-01-01	10.570000000000000