Year	Percent
1999-01-01	3.59352784508481
2000-01-01	2.88753495805034
2001-01-01	2.95191442183074
2002-01-01	3.31445967118180
2003-01-01	3.78732558369022
2004-01-01	3.75415118441524
2005-01-01	3.82748602047273
2006-01-01	3.70063495801150
2007-01-01	3.35627784817144
2008-01-01	3.24364240890039
2009-01-01	3.85412320126928
2010-01-01	4.06089887380529
2011-01-01	3.49402675702298
2012-01-01	3.76263154731027
2013-01-01	4.24377417944455
2014-01-01	4.39724189358182