Year % 1993 58.94 2000 15.86 2001 14.13 2002 22.52 2003 13.06 2005 17.96 2006 17.2 2008 14.58 2009 13.71 2010 13.91 2011 11.63 2012 14.11 2013 14.58 2014 14.98 2015 14.76 2016 14.61 2018 17.04 2019 15.25 2020 15.65 2021 20.56