Year	Percent
1999-01-01	2.1244000000000000
2000-01-01	2.1244000000000000
2001-01-01	2.1981400000000000
2002-01-01	1.8747500000000000
2003-01-01	2.3400200000000000
2004-01-01	2.5921300000000000
2005-01-01	2.7524900000000003
2006-01-01	3.3991700000000000
2007-01-01	3.3702800000000000
2008-01-01	2.7688300000000000
2009-01-01	3.2789599999999997
2010-01-01	4.0297800000000010
2011-01-01	3.7770500000000000
2012-01-01	3.6818000000000000
2013-01-01	3.9337900000000000