Year % 1995 24.69 1996 24.63 1997 24.63 1998 24.63 2000 24.63 2001 24.63 2002 24.34 2003 24.34 2004 24.34 2005 24.32 2006 24.34 2007 22.83 2008 22.83 2009 22.83 2010 22.83 2011 22.83 2012 22.81 2013 22.81 2014 22.81 2015 22.81 2016 22.81 2017 22.63 2018 22.63 2019 22.63 2020 22.63 2021 22.63