Year % 2003 58.14 2004 58.14 2006 58.14 2007 56.86 2008 56.86 2009 56.86 2010 56.86 2011 56.86 2012 55.03 2013 55.03 2015 55.03 2017 55.72 2018 55.72 2019 55.67 2020 55.67 2021 55.67