Year % 2001 68.56 2002 68.56 2003 68.95 2004 68.95 2005 68.95 2006 68.95 2007 69.28 2008 69.28 2009 69.28 2010 69.28 2011 69.28 2012 69.28 2013 69.28 2014 69.28 2015 67.88 2016 67.88 2017 68.13 2018 68.13 2019 68.13 2020 68.13 2021 68.13