Year	Percent
1980-01-01	0.09707500000000000
1981-01-01	0.06643600000000000
1982-01-01	0.21937300000000000
1983-01-01	0.03998700000000000
1984-01-01	0.10831800000000001
1985-01-01	0.28893500000000000
1986-01-01	0.34019699999999997
1987-01-01	0.18736200000000000
1988-01-01	0.23010799999999998
1989-01-01	0.21038600000000002
1990-01-01	0.10263900000000001
1991-01-01	0.05003500000000000
1992-01-01	0.05003500000000000
1993-01-01	0.05003500000000000
1994-01-01	0.05003500000000000
1995-01-01	0.05003500000000000
1996-01-01	0.05003500000000000
1997-01-01	0.05003500000000000
1998-01-01	0.05003500000000000
1999-01-01	0.05003500000000000
2000-01-01	0.05003500000000000
2001-01-01	0.05003500000000000
2002-01-01	0.05003500000000000
2003-01-01	0.05003500000000000
2004-01-01	0.05003500000000000
2005-01-01	8.16438000000000000
2006-01-01	3.36853000000000020
2007-01-01	4.07632000000000000
2008-01-01	4.84940000000000000
2009-01-01	5.06591000000000000
2010-01-01	4.99110000000000000
2011-01-01	2.92856000000000000
2012-01-01	3.30626000000000000