Year % 2004 7.31 2005 7.31 2006 7.31 2007 7.92 2008 7.92 2009 7.92 2010 7.92 2011 7.92 2012 7.81 2013 7.81 2014 7.81 2015 7.22 2016 7.22 2017 7.29 2018 7.29 2019 7.29 2020 7.29 2021 7.29