Year % 1996 57.02 2001 57.02 2002 57.02 2003 56.27 2004 56.27 2005 56.27 2006 56.27 2007 55.39 2008 55.39 2009 55.39 2010 55.39 2011 55.39 2012 55.39 2013 55.39 2014 55.39 2015 54.43 2016 54.43 2017 55.18 2018 55.18 2019 55.14 2020 55.14 2021 55.14