Year	Percent
1983-01-01	3.3719600000000000
1984-01-01	3.1856100000000000
1985-01-01	3.9475100000000000
1986-01-01	4.3920900000000005
1987-01-01	4.5573700000000000
1988-01-01	4.4494800000000000
1989-01-01	4.6712000000000000
1990-01-01	6.0677900000000005
1991-01-01	6.4405700000000000
1992-01-01	7.0030300000000000
1993-01-01	8.1243600000000010
1994-01-01	9.6907199999999990
1995-01-01	10.1713000000000000
1996-01-01	10.6169000000000000
1997-01-01	10.5188000000000000
1998-01-01	8.8898800000000000
1999-01-01	10.0232000000000000
2000-01-01	8.8621800000000000
2001-01-01	9.4501300000000000
2002-01-01	7.2231100000000000
2003-01-01	6.6336500000000000
2004-01-01	5.4910300000000000
2005-01-01	4.8161400000000000
2006-01-01	8.5952500000000000
2007-01-01	9.4876600000000000
2008-01-01	7.9324900000000000
2009-01-01	8.1485600000000000
2010-01-01	7.4976500000000000
2011-01-01	6.7217300000000000
2012-01-01	6.5181400000000000
2013-01-01	4.4695199999999990
2014-01-01	4.2148900000000005
2015-01-01	3.9409199999999998
2016-01-01	4.1665800000000010