Year	Percent
2004-01-01	22.5
2005-01-01	22.5
2006-01-01	20
2007-01-01	20.5
2008-01-01	21
2009-01-01	25
2010-01-01	23.5
2011-01-01	23
2012-01-01	26
2013-01-01	23.5