Year % 2001 11.75694352074683 2002 10.525091342281817 2003 9.824348740937264 2004 13.439723290070098 2005 12.023775261414427 2006 12.612198456665709 2007 19.067440695041807 2008 17.795966840705134 2009 20.187612193628684 2010 20.64159232926346 2011 14.537393935626358 2012 14.129552463061431 2013 15.040449540641607 2014 18.262438664666497 2015 17.77838033209575 2016 15.947144333004452 2017 17.807918861434704 2018 16.336978670139306 2019 16.010968050283928 2020 14.612616302557488 2021 16.02192096236079 2022 13.325081633577723 2023 11.374139499153046