Year	Percent
1999-01-01	6.91710643611729
2000-01-01	6.27774936759842
2001-01-01	4.70994123840949
2002-01-01	5.27367769631994
2003-01-01	5.41025992639737
2004-01-01	5.24701753025487
2005-01-01	4.46356749599406
2006-01-01	4.18207913513938
2007-01-01	4.11384742297444
2008-01-01	5.69139928611935
2009-01-01	9.03609652519279
2010-01-01	10.05464878950730
2011-01-01	10.82461238939690
2012-01-01	12.54428373415130
2013-01-01	13.11265935888700
2014-01-01	12.19794773743610