Year Percent of GDP 1998 21.778 1999 28.114 2000 23.488 2001 22.895 2002 22.138 2003 20.366 2004 18.667 2005 17.626 2006 17.243 2007 15.873 2008 14.565 2009 29.014 2010 36.216 2011 37.183 2012 39.774 2013 38.759 2014 40.541 2015 42.581 2016 39.933 2017 39.42 2018 35.908 2019 33.792 2020 31.819 2021 29.982 2022 28.348 2023 26.826 2024 25.421