Year	Percent
1975-01-01	9.2321
1976-01-01	8.4471
1977-01-01	5.8757
1978-01-01	6.6071
1979-01-01	13.2143
1980-01-01	18.9643
1981-01-01	12.8214
1982-01-01	10.3757
1983-01-01	9.0671
1984-01-01	10.1614
1985-01-01	9.8393
1986-01-01	8.1607
1987-01-01	8.5000
1988-01-01	10.3514
1989-01-01	12.0625
1990-01-01	11.6161
1991-01-01	7.4018
1992-01-01	6.7946
1993-01-01	3.7857
1994-01-01	5.5357
1995-01-01	5.7086
1996-01-01	3.0100
1997-01-01	4.3357
1998-01-01	5.1129
1999-01-01	4.7586
2000-01-01	5.8000
2001-01-01	2.2444
2002-01-01	2.7439
2003-01-01	2.7481
2004-01-01	2.4999
2005-01-01	3.2437
2006-01-01	4.2482
2007-01-01	4.2597
2008-01-01	1.5017
2009-01-01	0.2455
2010-01-01	0.9924
2011-01-01	0.9998
2012-01-01	0.9982
2013-01-01	1.0012
2014-01-01	1.0114
2015-01-01	0.5242
2016-01-01	0.4936
2017-01-01	0.9970