Year % 2001 62.51 2002 62.51 2003 61.44 2004 61.44 2005 61.44 2006 61.44 2007 60.4 2008 60.4 2009 60.4 2010 60.4 2011 60.4 2012 60.4 2013 60.4 2014 60.4 2015 58.56 2016 58.56 2017 59.38 2018 59.38 2019 59.33 2020 59.33 2021 59.33