Year	Percent
2003-01-01	3.87304397420484
2004-01-01	4.05858418647610
2005-01-01	4.07123876558011
2006-01-01	4.04498373944358
2007-01-01	3.67448227350336
2008-01-01	3.39348641481485
2009-01-01	4.20815582579854
2010-01-01	4.27462096075152
2011-01-01	4.20890604947348
2012-01-01	4.52586230325935
2013-01-01	4.52293566360468