Year	Percent
1980-01-01	2.5000
1981-01-01	2.5000
1982-01-01	3.0000
1983-01-01	3.0000
1984-01-01	3.0000
1985-01-01	3.0000
1986-01-01	3.0000
1987-01-01	3.0000
1988-01-01	3.0000
1989-01-01	3.5200
1990-01-01	2.9000
1991-01-01	4.3000
1992-01-01	7.0800
1993-01-01	6.5900
1994-01-01	7.0800
1995-01-01	6.2600
1996-01-01	8.4300
1997-01-01	8.5000
1998-01-01	8.6200
1999-01-01	7.9100
2000-01-01	9.8400
2001-01-01	9.6400
2002-01-01	12.5536
2003-01-01	12.0617
2004-01-01	11.9542
2005-01-01	11.9500
2006-01-01	12.0567
2007-01-01	12.3100
2008-01-01	12.2000
2009-01-01	12.2250
2010-01-01	12.7667
2011-01-01	12.1708
2012-01-01	12.4458
2013-01-01	11.7458
2014-01-01	11.7333
2015-01-01	11.7083
2016-01-01	11.8333