Year % 1995 23.68 1996 23.65 1997 23.65 1998 23.65 1999 23.65 2000 23.65 2001 23.65 2002 23.65 2003 23.65 2004 23.71 2005 23.71 2006 23.71 2007 23.71 2008 23.63 2009 23.63 2010 23.63 2011 23.63 2012 23.63 2013 23.56 2015 23.56 2016 23.56 2017 23.56 2018 23.61 2019 23.61 2020 23.61 2021 23.61