Year % 2001 8.26 2003 8.26 2004 8.06 2005 8.06 2006 8.06 2007 8.54 2008 8.49 2009 8.49 2010 8.49 2011 8.49 2012 8.49 2013 8.49 2014 8.48 2015 7.97 2016 7.97 2020 8.06 2021 8.06