Year % 2003 7.58 2004 7.58 2005 7.58 2006 7.57 2007 7.57 2008 7.57 2009 7.59 2010 7.59 2011 7.59 2012 7.59 2013 7.59 2014 7.57 2015 7.57 2016 7.57 2017 7.59 2018 7.59 2019 7.59 2020 7.59 2021 7.59