Year % 2001 15.74 2002 8.74 2004 9.72 2005 8.74 2006 8.28 2007 7.88 2008 7.89 2009 7.76 2010 7.76 2011 7.76 2012 7.52 2013 7.46 2014 7.47 2015 7.48 2016 7.47 2017 7.55 2018 7.56 2019 7.56 2020 7 2021 8.23