Year % 1996 23.33 1999 23.03 2000 14.36 2001 23.03 2002 14.38 2003 14.38 2006 14.36 2007 14.36 2008 14.36 2010 15.26 2011 15.26 2012 15.26 2013 15.26 2015 16.93 2016 16.93 2019 16.93