Year % 2001 7.86 2006 7.57 2007 7.59 2008 7.35 2009 7.33 2010 7.26 2011 7.11 2012 7.15 2013 7.18 2014 7.2 2015 7.23 2016 7.35 2017 7.49 2018 7.5 2019 7.64 2020 7.45 2021 7.41