Year	Percent
1996-01-01	3.5935300000000003
1997-01-01	3.7716800000000004
1998-01-01	3.4668200000000000
1999-01-01	3.3617100000000000
2000-01-01	3.3345900000000000
2001-01-01	3.1476200000000000
2002-01-01	3.3941100000000000
2003-01-01	3.5682300000000002
2004-01-01	2.7956000000000000
2005-01-01	2.4531600000000000
2006-01-01	2.5619600000000000
2007-01-01	2.1874800000000000
2008-01-01	1.7242000000000000
2009-01-01	1.6667500000000000
2010-01-01	1.6129400000000000
2011-01-01	1.8595599999999999
2012-01-01	1.7765099999999998
2013-01-01	2.4204900000000000
2014-01-01	1.9570700000000000
2015-01-01	1.9674300000000000
2016-01-01	2.0558900000000000