Year	Percent
2000-01-01	40.7228372361175
2001-01-01	39.7709153734840
2002-01-01	38.4881769765785
2003-01-01	38.1679819334902
2004-01-01	38.2364811069060
2005-01-01	38.5562195423045
2006-01-01	33.5831915876982
2007-01-01	35.3311549182702
2008-01-01	36.6445491044746
2009-01-01	36.9405608408589
2010-01-01	36.5919504787670
2011-01-01	36.6085844691270
2012-01-01	36.7289351537583
2013-01-01	36.6804347138549