Year % 2003 40.44 2004 40.44 2006 40.44 2007 47.84 2008 47.61 2009 46.71 2010 46.17 2011 45.69 2012 45.14 2013 44.97 2015 40.41 2017 40.42 2018 40.42 2019 40.42 2020 40.42 2021 40.42