Year	Percent
1999-01-01	3.56731745918629
2000-01-01	3.26656793051420
2001-01-01	3.02787437403083
2002-01-01	3.07192610356145
2003-01-01	3.21501070808815
2004-01-01	3.17148772146398
2005-01-01	3.30343829015787
2006-01-01	3.03250176716013
2007-01-01	2.47559008891114
2008-01-01	2.23995054275835
2009-01-01	2.99225292994516
2010-01-01	3.68011110398344
2011-01-01	4.05948684368276
2012-01-01	4.35813816260778
2013-01-01	4.94550184981155
2014-01-01	4.76024899073318