Year	Percent
1991-01-01	10.5892000000000000
1992-01-01	8.8508300000000000
1993-01-01	8.4091700000000000
1994-01-01	7.8725000000000000
1995-01-01	7.6650000000000000
1996-01-01	6.6000000000000000
1997-01-01	7.4783300000000010
1998-01-01	7.7791700000000000
1999-01-01	7.6683300000000000
2000-01-01	7.8883300000000010
2001-01-01	7.7375000000000000
2002-01-01	6.0283300000000000
2003-01-01	5.9458300000000000
2004-01-01	5.0375000000000000
2005-01-01	4.3700000000000000
2006-01-01	4.8825000000000000
2007-01-01	5.3375000000000000
2008-01-01	5.3525000000000000
2009-01-01	4.8766700000000000
2010-01-01	4.7233300000000010
2011-01-01	4.4475000000000000
2012-01-01	4.4431300000000000
2013-01-01	4.3116699999999994
2014-01-01	4.4508300000000010
2015-01-01	4.6108300000000000
2016-01-01	4.1978400000000000