Year	Percent
1980-01-01	9.0928700000000000
1981-01-01	9.5119899999999990
1982-01-01	8.7619200000000000
1983-01-01	6.5771500000000000
1984-01-01	5.7016900000000000
1985-01-01	7.0119399999999990
1986-01-01	6.1922200000000000
1987-01-01	4.2118199999999995
1988-01-01	2.6167200000000000
1989-01-01	1.8109000000000000
1990-01-01	0.9307219999999999
1991-01-01	2.3111700000000000
1992-01-01	2.1657400000000000
1993-01-01	2.1972900000000000
1994-01-01	1.4799900000000000
1995-01-01	1.2587600000000000
1996-01-01	1.7635000000000000
1997-01-01	2.7840900000000000
1998-01-01	3.5060500000000000
1999-01-01	5.3634200000000000
2000-01-01	6.3050400000000000
2001-01-01	7.1798199999999990
2002-01-01	8.8312800000000000
2003-01-01	10.5858000000000000
2004-01-01	11.9948000000000000
2005-01-01	10.6975000000000000
2006-01-01	10.9676000000000000
2007-01-01	8.5418700000000000
2008-01-01	8.0268500000000000
2009-01-01	8.3534800000000010
2010-01-01	8.7153500000000000
2011-01-01	9.8005100000000010
2012-01-01	12.8842000000000000
2013-01-01	11.1721000000000000
2014-01-01	12.4047000000000000
2015-01-01	14.9350000000000000
2016-01-01	20.8801000000000000