Year	Percent
1980-01-01	0.0032310000000000004
1981-01-01	0.0038240000000000000
1982-01-01	0.0035420000000000000
1983-01-01	0.0033020000000000002
1984-01-01	0.0029130000000000000
1985-01-01	0.0036600000000000000
1986-01-01	0.0033380000000000003
1987-01-01	0.0033380000000000003
1988-01-01	0.0033380000000000003
1989-01-01	0.0033380000000000003
1990-01-01	0.0033380000000000003
1991-01-01	0.0033380000000000003
1992-01-01	0.0033380000000000003
1993-01-01	0.0033380000000000003
1994-01-01	0.0089850000000000000
1995-01-01	0.0082519999999999990
1996-01-01	0.0078800000000000000
1997-01-01	0.0076860000000000000
1998-01-01	0.0081930000000000000
1999-01-01	0.0655050000000000000
2000-01-01	0.2143550000000000200
2001-01-01	0.5516050000000000000
2002-01-01	1.1853500000000000000
2003-01-01	1.8282599999999998000
2004-01-01	2.2296900000000000000
2005-01-01	2.7539000000000000000
2006-01-01	3.7738400000000003000
2007-01-01	4.0456699999999990000
2008-01-01	3.6083300000000005000
2009-01-01	4.1002700000000000000
2010-01-01	3.6986400000000000000
2011-01-01	3.1066800000000000000
2012-01-01	3.0208000000000000000
2013-01-01	2.6536700000000000000
2014-01-01	2.2356800000000000000
2015-01-01	2.2114000000000000000
2016-01-01	1.7580600000000000000