Year	Percent
1998-01-01	2.6000000000000000
1999-01-01	2.7000000000000000
2000-01-01	1.8000000000000000
2001-01-01	2.3000000000000000
2002-01-01	2.4000000000000000
2003-01-01	2.0000000000000000
2004-01-01	1.5000000000000000
2005-01-01	1.5000000000000000
2006-01-01	1.5000000000000000
2007-01-01	1.5000000000000000
2008-01-01	1.7000000000000000
2009-01-01	3.2000000000000000
2010-01-01	2.8323500000000000
2011-01-01	2.7108800000000000
2012-01-01	3.0978400000000000
2013-01-01	3.2271700000000000
2014-01-01	2.9826599999999996
2015-01-01	2.7119800000000000
2016-01-01	2.5308200000000003