Year % 1993 35.64 2000 11.04 2001 9.99 2002 24.4 2003 9.4 2005 19.64 2006 19.98 2008 19.25 2009 11.1 2010 10.76 2011 10.06 2012 10.25 2013 10.57 2014 10.5 2015 10.62 2016 11.05 2018 10.58 2019 11.15 2020 11.16 2021 10.72