Year % 1996 20.13 1999 16.72 2000 5.64 2001 5.66 2002 5.66 2003 5.66 2004 5.5 2006 5.52 2007 5.46 2010 5.45 2011 5.45 2012 8.78 2013 8.78 2015 5.66 2016 5.66 2020 5.68 2021 5.68