Year % 1996 29.85 2001 29.85 2002 29.85 2003 28.5 2004 28.5 2005 28.5 2006 28.5 2007 27.25 2008 27.25 2009 27.25 2010 27.25 2011 27.25 2012 27.25 2013 27.25 2014 27.25 2015 26.89 2016 26.89 2017 26.83 2018 26.83 2019 26.83 2020 26.83 2021 26.83