Year	Percent
1976-01-01	5.49724000000000100
1977-01-01	6.93510000000000000
1978-01-01	7.10961000000000100
1979-01-01	5.93286999999999900
1980-01-01	4.36506999999999900
1981-01-01	3.97846999999999970
1982-01-01	3.69225000000000000
1983-01-01	3.62123000000000000
1984-01-01	3.23015999999999970
1985-01-01	2.94205999999999970
1986-01-01	1.84833000000000000
1987-01-01	1.72242000000000000
1988-01-01	1.66783000000000000
1989-01-01	1.51071000000000000
1990-01-01	1.40560000000000000
1991-01-01	1.13812999999999990
1992-01-01	1.17464000000000000
1993-01-01	1.20499000000000000
1994-01-01	1.09443000000000000
1995-01-01	0.49484500000000000
1996-01-01	0.49823400000000000
1997-01-01	0.49690900000000000
1998-01-01	0.46630400000000000
1999-01-01	0.46849799999999997
2000-01-01	0.44176700000000000
2001-01-01	0.73670900000000010
2002-01-01	0.17783000000000000
2003-01-01	0.21824800000000000
2004-01-01	0.44420800000000000
2005-01-01	0.56042500000000000
2006-01-01	0.51212200000000010
2007-01-01	0.59057100000000000
2008-01-01	3.50191999999999970
2009-01-01	2.28550000000000000
2010-01-01	3.37180000000000000
2011-01-01	2.69839000000000030
2012-01-01	2.21687999999999970
2013-01-01	1.55912000000000000
2014-01-01	1.14448000000000000
2015-01-01	1.29034000000000000
2016-01-01	1.62295000000000000
2017-01-01	1.67220999999999980