Year	Percent
2000-01-01	74.8707912979073
2001-01-01	74.7114307022879
2002-01-01	74.0303289412528
2003-01-01	72.7536398123460
2004-01-01	72.4254458643698
2005-01-01	72.3710919254388
2006-01-01	72.8020406562574
2007-01-01	73.8887041981765
2008-01-01	74.7881477271568
2009-01-01	72.7964824547535
2010-01-01	71.8462471153918
2011-01-01	71.4191803959200
2012-01-01	71.6394534252545
2013-01-01	71.0772219378881