Year	Percent
1998-01-01	3.4573099999999997
1999-01-01	2.9769900000000002
2000-01-01	3.0993300000000000
2001-01-01	2.1397200000000000
2002-01-01	4.5735500000000000
2003-01-01	1.7227100000000000
2004-01-01	1.4880300000000000
2005-01-01	1.5749600000000001
2006-01-01	2.9688700000000000
2007-01-01	2.8302099999999997
2008-01-01	2.6251800000000000
2009-01-01	2.6251800000000000
2010-01-01	2.6251800000000000
2011-01-01	3.4173900000000000
2012-01-01	3.1999200000000000
2013-01-01	3.2492799999999997
2014-01-01	2.9503100000000000