Year % 2001 35.8 2002 35.8 2003 34.45 2004 34.45 2005 34.45 2006 34.45 2007 33.18 2008 33.18 2009 33.18 2010 33.18 2011 33.18 2012 33.18 2013 33.18 2014 33.18 2015 32.96 2016 32.96 2017 32.94 2018 32.94 2019 32.94 2020 32.94 2021 32.94