Year % 2002 7.91 2004 7.9 2005 6.34 2006 6.34 2008 6.41 2009 6.39 2010 6.43 2011 6.43 2012 6.4 2013 6.4 2014 8.42 2015 8.42 2016 8.42 2018 6.18 2019 6.18 2020 7.19 2021 7.93