Year	Percent
1975-01-01	12.14530000000000000
1976-01-01	16.50760000000000000
1977-01-01	15.25390000000000000
1978-01-01	9.73565000000000000
1979-01-01	7.10858999999999950
1980-01-01	7.28858999999999900
1981-01-01	6.94459000000000000
1982-01-01	5.55975000000000000
1983-01-01	4.76716000000000000
1984-01-01	4.02851000000000000
1985-01-01	2.80540000000000000
1986-01-01	2.67486000000000000
1987-01-01	2.76399000000000000
1988-01-01	2.06792000000000000
1989-01-01	1.60135000000000000
1990-01-01	2.25745000000000000
1991-01-01	2.11779000000000030
1992-01-01	2.26680000000000000
1993-01-01	1.78568000000000000
1994-01-01	1.64061000000000000
1995-01-01	1.16972000000000000
1996-01-01	0.89234300000000000
1997-01-01	0.81522299999999990
1998-01-01	0.75683500000000000
1999-01-01	0.48065200000000000
2000-01-01	0.32031500000000000
2001-01-01	0.32621000000000000
2002-01-01	0.35068800000000000
2003-01-01	0.36356300000000000
2004-01-01	0.87811000000000010
2005-01-01	1.18561000000000000
2006-01-01	1.02557000000000000
2007-01-01	0.84277600000000000
2008-01-01	0.42780200000000007
2009-01-01	0.14813300000000000
2010-01-01	0.17456700000000000
2011-01-01	0.13014100000000000
2012-01-01	0.13772800000000000
2013-01-01	0.24138400000000002
2014-01-01	0.28382100000000000
2015-01-01	0.20835300000000000
2016-01-01	0.15734500000000000
2017-01-01	0.20873600000000000