Year % 1993 13.64 2000 14.26 2001 12.52 2002 12.52 2003 12.52 2007 13.03 2008 12.97 2009 12.96 2010 12.88 2013 12.49 2016 12.3 2017 12.33 2018 12.39 2019 12.44 2020 12.84 2021 12.84