Year	Percent
1991-01-01	2.8376000000000000
1992-01-01	2.7447900000000000
1993-01-01	4.0844400000000000
1994-01-01	2.7556700000000003
1995-01-01	2.3887600000000000
1996-01-01	2.2153900000000000
1997-01-01	2.2823900000000004
1998-01-01	2.3217600000000000
1999-01-01	2.1569700000000003
2000-01-01	2.2293600000000000
2001-01-01	2.0868800000000000
2002-01-01	2.5301099999999996
2003-01-01	3.9656100000000000
2004-01-01	3.7144699999999995
2005-01-01	3.6478000000000000
2006-01-01	3.7030300000000005
2007-01-01	3.3777300000000000
2008-01-01	3.0355600000000000
2009-01-01	3.0946800000000000
2010-01-01	2.8921400000000000
2011-01-01	2.6114599999999997
2012-01-01	2.4575099999999996
2013-01-01	2.6907900000000002
2014-01-01	2.4409300000000000
2015-01-01	3.8743100000000000
2016-01-01	3.2869200000000000
2017-01-01	3.3684700000000000