Year	Percent
1975-01-01	1.22638000000000000
1976-01-01	1.16781000000000000
1977-01-01	1.10762000000000000
1978-01-01	1.08294000000000000
1979-01-01	0.88585500000000000
1980-01-01	0.94252600000000000
1981-01-01	0.89776100000000000
1982-01-01	0.80912800000000000
1983-01-01	0.79069600000000000
1984-01-01	0.71473800000000000
1985-01-01	0.68467800000000000
1986-01-01	0.57177100000000000
1987-01-01	0.49819600000000000
1988-01-01	0.47724500000000000
1989-01-01	0.44994399999999996
1990-01-01	0.40843300000000000
1991-01-01	0.37114100000000000
1992-01-01	0.41902799999999996
1993-01-01	0.44333100000000003
1994-01-01	0.49729600000000000
1995-01-01	0.45087900000000000
1996-01-01	0.45634300000000005
1997-01-01	0.49252100000000000
1998-01-01	0.52726500000000000
1999-01-01	0.10029000000000000
2000-01-01	0.10909300000000001
2001-01-01	0.11173699999999999
2002-01-01	0.10558900000000002
2003-01-01	0.09919900000000000
2004-01-01	0.09448200000000001
2005-01-01	0.09814800000000000
2006-01-01	0.10130600000000000
2007-01-01	0.11334500000000000
2008-01-01	0.11256700000000000
2009-01-01	0.10161600000000000
2010-01-01	0.11004300000000000
2011-01-01	0.11380100000000000
2012-01-01	0.15600999999999998
2013-01-01	0.22107399999999996
2014-01-01	0.22438800000000000
2015-01-01	0.22127500000000000
2016-01-01	0.21252900000000000
2017-01-01	0.22876600000000000