Year % 2001 12.62 2002 12.7 2003 12.69 2004 12.7 2005 12.68 2006 11.57 2007 11.03 2008 11.03 2009 11.03 2010 11.03 2011 11.15 2012 11.15 2013 11.15 2014 10.64 2015 11.81 2016 11.2 2017 17.84 2018 15.25 2019 9.86 2020 9.86 2021 10.89