Year	Percent
2005-01-01	4.07053294744287
2006-01-01	3.75341101521286
2007-01-01	3.31079159659648
2008-01-01	3.18684722356144
2009-01-01	3.79520967097909
2010-01-01	4.09979828589263
2011-01-01	4.18594934462363
2012-01-01	4.54694334727096