Year % 1993 26.73 1997 14.15 2001 14.79 2002 13.14 2003 13.96 2004 14.95 2005 13.91 2006 14.8 2007 14.27 2008 14.2 2009 13.59 2010 13.38 2011 13.39 2012 13.65 2013 13.16 2015 13.03 2016 14.76 2018 13.37 2020 13.99 2021 14.38