Year % 2008 8.5563362653156 2009 10.84215703164 2010 10.4676943505694 2011 10.7646981785138 2012 10.0960726886888 2013 10.3515203225993 2014 11.5668782833913 2015 12.0159015689814 2016 11.6296074357592 2017 11.3934047974268 2018 10.8232721834834 2019 11.594317854372 2020 11.8822023363105 2021 11.0928039654857 2022 9.83864059152043