Year	Percent
1980-01-01	10.72290000000000000
1981-01-01	9.58499000000000000
1982-01-01	9.44508000000000000
1983-01-01	10.51500000000000000
1984-01-01	9.39266999999999900
1985-01-01	8.80390000000000000
1986-01-01	9.19572000000000000
1987-01-01	8.76223000000000000
1988-01-01	8.27363999999999900
1989-01-01	8.26577000000000000
1990-01-01	6.67838000000000100
1991-01-01	7.28508000000000100
1992-01-01	8.00761000000000100
1993-01-01	7.77463000000000000
1994-01-01	6.57393999999999950
1995-01-01	6.18863000000000000
1996-01-01	5.44111000000000000
1997-01-01	4.30441000000000000
1998-01-01	4.42092000000000000
1999-01-01	5.37387000000000000
2000-01-01	3.49941999999999980
2001-01-01	1.61446000000000000
2002-01-01	1.54247000000000000
2003-01-01	0.63116900000000000
2004-01-01	0.65769600000000010
2005-01-01	0.07244600000000001
2006-01-01	0.33295800000000000
2007-01-01	0.95328899999999990
2008-01-01	2.13739000000000030
2009-01-01	3.69224000000000000
2010-01-01	3.49124000000000030
2011-01-01	2.59543000000000000
2012-01-01	3.19465000000000000
2013-01-01	3.47943000000000020
2014-01-01	4.50646000000000000
2015-01-01	4.51851000000000000
2016-01-01	6.43759000000000000