Year % 1996 10.09 1997 15.42 1998 10.09 1999 10.09 2000 17.94 2001 10.24 2002 10.41 2003 10.41 2004 10.28 2005 10.54 2006 10.45 2007 9.68 2008 10.87 2010 9.65 2011 9.66 2012 10.54 2013 10.58 2015 10.58 2016 10.58 2017 10.58 2018 10.58 2020 10.58 2021 10.58