Year % 2001 11.714648674114954 2002 9.576103277799023 2003 9.17136946179508 2004 11.088611051068815 2005 9.464345437526097 2006 9.466906382131437 2007 13.753637770366108 2008 10.230718364725293 2009 17.962042834929935 2010 17.688174971911334 2011 14.33255415297315 2012 13.779228522442816 2013 14.343512058447718 2014 15.441938335115623 2015 17.439009849469226 2016 13.616947885917336 2017 14.845244942223097 2018 13.325462435642144 2019 13.96476020883723 2020 14.610731450071043 2021 14.581225433097245 2022 11.502989079768426 2023 11.374139499153046