Year	Percent
2003-01-01	6.280992985
2004-01-01	10.383783340
2005-01-01	14.681278230
2006-01-01	18.260509490
2007-01-01	21.457113270
2008-01-01	26.729616170
2009-01-01	30.450315480
2010-01-01	31.502517700
2011-01-01	32.755725860