Year % 2003 8.42 2004 8.42 2005 8.42 2006 8.44 2007 8.44 2008 8.44 2009 8.47 2010 8.47 2011 8.47 2012 8.47 2013 8.47 2014 8.68 2015 8.68 2016 8.68 2017 8.7 2018 8.7 2019 8.7 2020 8.7 2021 8.7