Year % 1993 14.19 2000 13.93 2001 12.51 2002 12.51 2003 12.51 2004 12.53 2007 12.47 2008 12.46 2009 12.46 2010 12.35 2013 12.34 2016 11.74 2017 11.6 2018 11.61 2019 11.61 2020 11.79 2021 11.79