Year Percent of GDP 2002 6.845 2003 9.826 2004 12.676 2005 14.733 2006 18.946 2007 18.986 2008 17.036 2009 19.391 2010 21.722 2011 21.265 2012 25.21 2013 24.346 2014 23.684 2015 24.569 2016 26.116 2017 25.25 2018 27.983 2019 25.994 2020 29.081 2021 30.147 2022 31.326 2023 32.731 2024 32.687