Year	Percent
1986-01-01	8.6348600000000000
1987-01-01	8.6063700000000000
1988-01-01	7.4544000000000000
1989-01-01	7.1575000000000000
1990-01-01	6.5024500000000000
1991-01-01	0.9607000000000000
1992-01-01	0.7342010000000000
1993-01-01	6.0747900000000000
1994-01-01	5.8657600000000000
1995-01-01	4.9049300000000000
1996-01-01	5.0110500000000000
1997-01-01	4.9415400000000000
1998-01-01	4.8316099999999995
1999-01-01	4.7509700000000000
2000-01-01	4.8685500000000000
2001-01-01	4.5236100000000000
2002-01-01	4.4230500000000000
2003-01-01	4.2963200000000000
2004-01-01	4.1091000000000000
2005-01-01	4.0705200000000000
2006-01-01	4.1833100000000000
2007-01-01	4.4283700000000000
2008-01-01	3.8503700000000000
2009-01-01	4.3052600000000000
2010-01-01	4.2652100000000000
2011-01-01	4.3240800000000000
2012-01-01	4.4894700000000000
2013-01-01	4.3798400000000000
2014-01-01	6.0160500000000000
2015-01-01	5.5068400000000000
2016-01-01	0.2117320000000000
2017-01-01	5.2769500000000000