Year % 1995 33.37 1996 33.35 1997 33.35 1998 33.35 1999 33.35 2000 33.35 2001 33.35 2002 33.42 2003 33.42 2004 33.42 2005 33.42 2006 33.42 2007 33.42 2008 33.35 2009 33.35 2010 33.35 2011 33.35 2012 33.35 2013 33.35 2014 33.35 2015 33.35 2016 33.35 2017 33.4 2018 33.4 2019 33.4 2020 33.4 2021 33.4