Year % 2003 34.415 2004 32.922 2005 33.673 2006 30.184 2007 40.105 2008 33.602 2009 32.678 2010 33.553 2011 43.856 2012 43.235 2013 34.571 2014 35.696 2015 33.507 2016 34.018 2017 35.312 2018 35.535 2019 37.27 2020 39.445 2021 37.598 2022 39.875 2023 42.374