Year % 2001 12.76 2002 12.76 2003 12.47 2004 12.47 2005 12.47 2006 12.47 2007 11.59 2008 11.59 2009 11.59 2010 11.59 2011 11.59 2012 11.59 2013 11.59 2014 11.59 2015 11.27 2016 11.27 2017 11.25 2018 11.25 2019 11.25 2020 11.25 2021 11.25