Year	Percent
1983-01-01	3.1881400000000000
1984-01-01	1.2535700000000000
1985-01-01	1.0183200000000001
1986-01-01	1.1427399999999999
1987-01-01	2.0157400000000000
1988-01-01	4.1790199999999995
1989-01-01	2.5584000000000000
1990-01-01	1.5619500000000000
1991-01-01	2.6617100000000000
1992-01-01	2.0860800000000000
1993-01-01	2.0987299999999998
1994-01-01	2.2812300000000000
1995-01-01	1.3494899999999999
1996-01-01	1.3893200000000000
1997-01-01	1.2407900000000000
1998-01-01	1.7763400000000003
1999-01-01	1.6359800000000000
2000-01-01	1.6673400000000000
2001-01-01	1.6805599999999998
2002-01-01	4.3562100000000000
2003-01-01	4.4549699999999990
2004-01-01	4.1452200000000000
2005-01-01	3.6203700000000000
2006-01-01	4.2046000000000000
2007-01-01	2.5550300000000000
2008-01-01	2.3605800000000000
2009-01-01	2.2998800000000000
2010-01-01	1.9347900000000002
2011-01-01	1.9710400000000001
2012-01-01	1.9247800000000000
2013-01-01	2.0301900000000000
2014-01-01	1.3375000000000000
2015-01-01	2.8069700000000000
2016-01-01	1.8198800000000000