Year	Percent
1980-01-01	3.0947100000000000
1981-01-01	2.6717900000000000
1982-01-01	2.5641800000000000
1983-01-01	3.7295599999999998
1984-01-01	3.3715599999999997
1985-01-01	4.7082500000000000
1986-01-01	2.7266800000000000
1987-01-01	2.0802500000000000
1988-01-01	1.7027000000000000
1989-01-01	1.2082100000000000
1990-01-01	1.0071000000000000
1991-01-01	0.5558640000000000
1992-01-01	0.5741260000000000
1993-01-01	1.3530700000000000
1994-01-01	1.2810600000000000
1995-01-01	1.3321100000000001
1996-01-01	1.4621100000000000
1997-01-01	0.8742059999999999
1998-01-01	2.6869700000000000
1999-01-01	4.1010500000000000
2000-01-01	3.7280500000000000
2001-01-01	4.6733800000000000
2002-01-01	4.9781900000000010
2003-01-01	3.8557400000000000
2004-01-01	3.9559599999999997
2005-01-01	4.4034100000000000
2006-01-01	4.2920500000000000
2007-01-01	4.3065800000000000
2008-01-01	5.7220400000000000
2009-01-01	5.1649600000000000
2010-01-01	5.2556500000000000
2011-01-01	4.8866100000000000
2012-01-01	5.5480100000000000
2013-01-01	6.6916300000000000
2014-01-01	8.1900000000000000
2015-01-01	10.0386000000000000
2016-01-01	9.9480800000000010