Year	Percent
1999-01-01	53.3856139152783
2000-01-01	53.0601591089936
2001-01-01	53.3394612670151
2002-01-01	54.0509473155555
2003-01-01	53.7120871102685
2004-01-01	53.3805000421661
2005-01-01	54.2461476123421
2006-01-01	54.7024431757382
2007-01-01	55.6157679277411
2008-01-01	56.0606980285014
2009-01-01	54.7671561314972
2010-01-01	54.1709785798000
2011-01-01	53.9002748253351
2012-01-01	53.8117808346652
2013-01-01	54.0743671825031