Year	Percent
2005-01-01	37.9562396379461
2006-01-01	38.2356636132716
2007-01-01	38.9232048040072
2008-01-01	39.3886277422066
2009-01-01	39.0199525284580
2010-01-01	38.8473543713146
2011-01-01	38.9669061236822
2012-01-01	38.9033416613902