Year	Percent
1980-01-01	7.250000000000000
1981-01-01	7.250000000000000
1982-01-01	7.250000000000000
1983-01-01	7.250000000000000
1984-01-01	7.250000000000000
1985-01-01	7.625000000000000
1986-01-01	7.750000000000000
1987-01-01	6.750000000000000
1988-01-01	5.750000000000000
1989-01-01	5.687500000000000
1990-01-01	6.291670000000000
1991-01-01	10.250000000000000
1992-01-01	8.937500000000000
1993-01-01	10.000000000000000
1994-01-01	10.000000000000000
1995-01-01	10.000000000000000
1996-01-01	7.243330000000000
1997-01-01	8.335250000000000
1998-01-01	6.872000000000001
1999-01-01	7.869750000000000
2000-01-01	6.998670000000000
2001-01-01	6.375000000000000
2002-01-01	6.566669999999999
2003-01-01	6.827500000000000
2004-01-01	7.044500000000000
2005-01-01	7.307250000000000
2006-01-01	7.903330000000000
2007-01-01	8.662500000000000
2008-01-01	10.703800000000000
2009-01-01	9.207150000000000
2010-01-01	10.712100000000000
2011-01-01	9.130239999999999
2012-01-01	8.005830000000000
2013-01-01	7.538480000000000
2014-01-01	9.577689999999999
2015-01-01	9.488230000000000