Year % 2001 9.64 2002 9.63 2003 9.63 2004 9.63 2005 9.63 2006 9.63 2007 9.55 2008 9.55 2009 9.55 2010 9.55 2011 9.55 2014 9.51 2015 9.51 2016 9.51 2017 9.53 2018 9.53 2019 9.53 2020 9.53 2021 9.53