Year % 1995 42.71 1996 42.71 1997 42.5 1998 42.5 1999 42.5 2000 42.5 2001 42.5 2002 42.53 2003 42.53 2004 42.53 2005 42.53 2006 42.53 2007 42.8 2008 42.8 2009 42.8 2010 42.8 2011 42.8 2012 42.74 2013 42.74 2014 42.74 2016 42.74 2018 42.76 2019 42.76 2020 42.76 2021 42.76