Year % 1995 29.05 1997 29.05 1998 28.97 1999 28.97 2000 28.97 2001 28.97 2002 28.99 2003 28.99 2004 28.99 2005 28.99 2006 28.99 2007 28.99 2008 29.17 2009 29.17 2010 29.17 2011 29.17 2013 29.16 2014 29.16 2015 29.16 2017 29.17 2018 29.17 2019 29.17 2020 29.17 2021 29.17