Year % 2001 15.864580923651491 2002 13.230899068262142 2003 11.880206873002962 2004 12.659104518323257 2005 9.915011824820587 2006 10.335179315687 2007 12.162271482981353 2008 9.441360209645168 2009 12.12382362306364 2010 12.808355172777086 2011 11.719996793143835 2012 16.45726241286205 2013 17.929092126696435 2014 19.262494464255383 2015 18.428210850085026 2016 17.723841875658607 2017 18.6236280704522 2018 16.96174640196911 2019 19.165118025909667 2020 22.363903324464196 2021 20.583556871499376 2022 23.667022518240245 2023 21.982333576418213