Year	Percent
1975-01-01	2.440220000000000000
1976-01-01	1.957540000000000000
1977-01-01	1.639970000000000100
1978-01-01	1.737709999999999900
1979-01-01	2.145880000000000000
1980-01-01	2.549990000000000000
1981-01-01	2.598580000000000000
1982-01-01	2.864330000000000000
1983-01-01	2.728940000000000000
1984-01-01	3.819509999999999700
1985-01-01	4.941560000000000000
1986-01-01	4.382810000000000000
1987-01-01	4.070280000000000000
1988-01-01	3.216740000000000000
1989-01-01	2.771920000000000000
1990-01-01	2.500909999999999700
1991-01-01	2.484870000000000000
1992-01-01	1.757170000000000100
1993-01-01	1.124420000000000000
1994-01-01	0.962526000000000000
1995-01-01	0.950167000000000000
1996-01-01	1.311180000000000000
1997-01-01	1.300290000000000000
1998-01-01	0.928436000000000000
1999-01-01	0.857382000000000000
2000-01-01	0.809721000000000000
2001-01-01	0.677729000000000000
2002-01-01	0.506003000000000000
2003-01-01	0.429951000000000000
2004-01-01	0.368807000000000000
2005-01-01	0.344079000000000000
2006-01-01	0.264482000000000000
2007-01-01	0.258957000000000000
2008-01-01	0.262633000000000000
2009-01-01	0.137702000000000000
2010-01-01	0.056104999999999995
2011-01-01	0.045879000000000000
2012-01-01	0.052745000000000010
2013-01-01	0.485069000000000000
2014-01-01	1.075189999999999900
2015-01-01	0.576805000000000000