Year % 1995 28.63 1996 28.54 1997 28.54 1998 28.54 1999 28.54 2001 28.54 2002 28.54 2003 28.98 2004 28.98 2005 28.98 2006 28.98 2007 28.54 2008 28.54 2009 28.54 2010 28.54 2011 28.54 2012 28.54 2013 28.54 2014 28.54 2015 29.5 2016 29.5 2017 29.65 2018 29.65 2019 29.65 2020 29.65 2021 29.65