Year	Percent
1996-01-01	3.2067099999999997
1997-01-01	2.5858500000000000
1998-01-01	4.6672000000000000
1999-01-01	3.1345000000000000
2000-01-01	3.2011700000000003
2001-01-01	3.6012300000000000
2002-01-01	3.0151000000000000
2003-01-01	2.9016400000000000
2004-01-01	2.9664400000000000
2005-01-01	2.3575100000000000
2006-01-01	2.5162200000000000
2007-01-01	2.3783200000000000
2008-01-01	1.8629799999999999
2009-01-01	1.8662000000000000
2010-01-01	1.7086400000000002
2011-01-01	1.7477800000000000
2012-01-01	1.7525900000000000
2013-01-01	1.5536400000000000
2014-01-01	1.3950500000000000
2015-01-01	1.4780700000000000
2016-01-01	1.4770900000000000