Year Percent of GDP 2002 18.651 2003 23.263 2004 26.394 2005 26.108 2006 27.862 2007 31.1 2008 31.767 2009 30.479 2010 29.986 2011 26.069 2012 28.915 2013 34.703 2014 29.829 2015 31.056 2016 30.961 2017 32.577 2018 28.6 2019 27.932 2020 28.014 2021 27.909 2022 27.899 2023 27.327 2024 27.35