Year	Percent
1981-01-01	0.11547800000000000
1982-01-01	0.11471300000000001
1983-01-01	0.14412900000000000
1984-01-01	0.14204800000000000
1985-01-01	0.15106800000000000
1986-01-01	0.15106800000000000
1987-01-01	0.15106800000000000
1988-01-01	0.15106800000000000
1989-01-01	0.15106800000000000
1990-01-01	0.15106800000000000
1991-01-01	0.15106800000000000
1992-01-01	0.15106800000000000
1993-01-01	0.15106800000000000
1994-01-01	0.30301600000000000
1995-01-01	0.24009200000000000
1996-01-01	0.17736800000000000
1997-01-01	8.54723000000000000
1998-01-01	7.88988000000000100
1999-01-01	8.63565000000000000
2000-01-01	8.36800000000000000
2001-01-01	8.32210000000000000
2002-01-01	8.36839000000000000
2003-01-01	8.29033999999999900
2004-01-01	9.36666000000000100
2005-01-01	10.51660000000000000
2006-01-01	10.32790000000000000
2007-01-01	11.89180000000000000
2008-01-01	8.78386000000000000
2009-01-01	11.08320000000000000
2010-01-01	12.54470000000000000
2011-01-01	12.04520000000000000
2012-01-01	14.01100000000000000
2013-01-01	15.39920000000000000
2014-01-01	18.88240000000000000
2015-01-01	22.23800000000000300
2016-01-01	22.28430000000000000