Year % 1996 21.06 1997 11.4 1998 11.41 1999 18.5 2000 17.17 2001 9.91 2002 9.9 2003 9.9 2006 9.92 2007 9.92 2010 10.15 2011 10.02 2012 10.27 2013 10.02 2015 9.95 2016 9.95 2017 9.92 2020 10.63