Year	Percent
1983-01-01	6.4689999999999990
1984-01-01	9.0610000000000000
1985-01-01	11.2160000000000000
1986-01-01	10.3640000000000000
1987-01-01	13.6130000000000000
1988-01-01	6.4140000000000000
1989-01-01	13.5590000000000010
1990-01-01	12.3479999999999990
1991-01-01	9.4855500000000000
1992-01-01	9.1807500000000000
1993-01-01	9.8471100000000000
1994-01-01	11.1486000000000000
1995-01-01	16.4802000000000000
1996-01-01	7.5720100000000010
1997-01-01	10.9906000000000000
1998-01-01	11.4235000000000000
1999-01-01	5.6791100000000000
2000-01-01	1.1470200000000002
2001-01-01	6.5038300000000010
2002-01-01	10.1741000000000000
2003-01-01	5.7062500000000000
2004-01-01	6.9046100000000010
2005-01-01	3.2011400000000000
2006-01-01	3.0986599999999997
2007-01-01	3.6176900000000000
2008-01-01	2.9886400000000000
2009-01-01	2.3545200000000000
2010-01-01	2.3680500000000000
2011-01-01	2.3313300000000000
2012-01-01	2.0864300000000000
2013-01-01	2.2782000000000000
2014-01-01	1.0460000000000000