Year Percent of GDP 2003 16.846 2004 23.239 2005 24.121 2006 28.378 2007 32.266 2008 40.559 2009 39.894 2010 34.66 2011 27.497 2012 23.045 2013 25.92 2014 26.431 2015 33.68 2016 25.57 2017 27.862 2018 30.512 2019 29.793 2020 29.109 2021 28.401 2022 28.656 2023 29.009 2024 29.318