Year % 2002 26.67 2003 26.73 2005 21.32 2006 9.09 2007 9.09 2008 9.09 2009 15.61 2010 15.61 2011 15.45 2012 16.55 2013 16.4 2014 16.63 2015 16.59 2016 16.37 2018 16.71 2019 16.71 2020 16.74 2021 16.76