Year % 2001 12.44 2002 12.47 2003 13.56 2004 13.56 2005 13.52 2006 13.57 2007 11.44 2008 11.44 2009 11.44 2010 11.44 2011 11.44 2012 11.44 2013 11.44 2014 10.47 2015 11.52 2016 11.25 2017 13.83 2018 12.88 2019 9.74 2020 9.74 2021 10.08