Year	Percent
1980-01-01	1.0000
1981-01-01	5.0000
1982-01-01	5.0000
1983-01-01	6.0000
1984-01-01	6.0000
1985-01-01	5.0000
1986-01-01	3.7500
1987-01-01	18.0000
1988-01-01	8.5000
1989-01-01	12.0000
1990-01-01	12.0000
1991-01-01	8.4500
1992-01-01	14.0000
1993-01-01	21.0000
1994-01-01	21.3000
1995-01-01	21.1400
1996-01-01	15.6200
1997-01-01	17.0000
1998-01-01	17.0000
1999-01-01	17.6000
2000-01-01	18.2000
2001-01-01	13.8000
2002-01-01	10.3300
2003-01-01	10.3300
2004-01-01	11.4200
2005-01-01	12.8600
2006-01-01	12.8600
2007-01-01	14.4500
2008-01-01	13.4200
2009-01-01	12.5500
2010-01-01	11.6700
2011-01-01	10.6100
2012-01-01	10.6100
2013-01-01	12.0667
2014-01-01	13.6592
2015-01-01	13.9200
2016-01-01	13.8500