Year Percent of GDP 2004 56.052 2005 67.274 2006 61.04 2007 53.96 2008 56.399 2009 46.18 2010 45.396 2011 48.114 2012 46.986 2013 42.187 2014 38.152 2015 30.619 2016 27.578 2017 33.364 2018 39.597 2019 39.397 2020 39.396 2021 37.73 2022 36.468 2023 35.502 2024 33.906