Year % 1996 21.22 1999 17.77 2001 9.23 2002 9.23 2003 9.23 2006 9.02 2007 9.02 2008 9.02 2009 8.96 2010 8.96 2011 8.9 2012 8.9 2013 8.97 2014 8.97 2015 8.97 2016 8.97 2017 8.97 2018 8.97 2019 8.97 2020 9.04 2021 9.04