Year	Percent
1999-01-01	3.67372351499305
2000-01-01	3.01296012344835
2001-01-01	2.79668493487100
2002-01-01	3.20741631667265
2003-01-01	3.49900538828483
2004-01-01	3.64693741595960
2005-01-01	3.72644058910690
2006-01-01	3.63408540809566
2007-01-01	3.32607387450781
2008-01-01	3.11332823949426
2009-01-01	3.51587069364167
2010-01-01	3.72675795141931
2011-01-01	3.15472501445800
2012-01-01	3.33486561603470
2013-01-01	3.74665640336129
2014-01-01	3.78605515696066