Year Percent of GDP 2001 34.984 2002 75.699 2003 71.056 2004 61.201 2005 50.723 2006 47.443 2007 37.808 2008 27.896 2009 30.727 2010 31.098 2011 28.78 2012 25.931 2013 24.159 2014 22.951 2015 25.798 2016 29.935 2017 32.319 2018 36.245 2019 38.148 2020 38.44 2021 38.805 2022 39.295 2023 39.691 2024 39.634