Year % of GDP 2005 25.537518878457433 2006 24.033767607489644 2007 24.538887805101904 2008 25.078452421404613 2009 23.158814107720406 2010 23.318470365139234 2011 24.029145050002594 2012 24.919476106337562 2013 26.875655643866654 2014 27.97909237541052 2015 27.954980513294046 2016 28.087309789954634 2017 29.47154045310581 2018 30.757587870506843 2019 32.04307036996452 2020 27.738147236374918 2021 28.621955883305933 2022 33.444917051828796 2023 33.15175860939144