Year	Percent
2003-01-01	33.9597315436242
2004-01-01	34.4474153297683
2005-01-01	35.7300397000441
2006-01-01	37.5000000000000
2007-01-01	38.7547834904450
2008-01-01	37.0362792951341
2009-01-01	38.5471413776858
2010-01-01	39.0064311411202
2011-01-01	38.9303924604361
2012-01-01	40.5794337442946
2013-01-01	40.7453365451615