Year % 1996 24.35 1997 24.35 1998 24.35 1999 24.35 2000 24.35 2001 24.35 2002 24.35 2003 24.35 2004 24.35 2005 24.35 2006 24.35 2007 26.53 2008 26.54 2009 26.47 2010 26.44 2011 26.43 2014 26.51 2016 24.31 2017 24.28 2018 24.28 2019 24.28 2020 24.28 2021 24.28