Year % 2001 13.257461980956501 2002 13.070175486215552 2003 23.169286454849324 2004 23.26460607874674 2005 29.536001617476533 2006 30.076891700510394 2007 30.916464515503367 2008 40.29924894702812 2009 36.932594843170655 2010 26.673778367154966 2011 28.88667444962834 2012 37.22723026055491 2013 39.073411886366586 2014 39.83329272541113 2015 32.51127608508424 2016 32.00746972889491 2017 37.821959726901135 2018 36.317472890712374 2019 34.13235875120792 2020 35.49290523979344 2021 35.2984242295079 2022 30.940167895633635 2023 30.457184913678105