Year % 2001 12.44 2002 12.47 2003 13.56 2004 13.56 2005 13.52 2006 12.47 2007 10.25 2008 10.25 2009 10.25 2010 10.25 2011 10.53 2012 10.53 2013 10.53 2014 9.89 2015 9.12 2016 8.99 2017 13.83 2018 12.44 2019 7.67 2020 7.67 2021 8.55