Year % 1993 13.6 2000 27.24 2001 8.66 2002 8.66 2003 8.66 2007 9.15 2008 8.94 2009 13.72 2010 14.61 2013 14.7 2016 14.78 2017 14.64 2018 15.95 2019 15.52 2020 13.77 2021 13.77