Year Percent of GDP 1998 20.337 1999 21.207 2000 22.586 2001 24.369 2002 25.073 2003 28.183 2004 24.684 2005 26.189 2006 26.072 2007 28.111 2008 27.067 2009 31.606 2010 30.017 2011 27.026 2012 29.456 2013 30.526 2014 28.529 2015 29.24 2016 28.405 2017 28.387 2018 28.226 2019 28.135 2020 27.814 2021 27.713 2022 27.604 2023 27.588 2024 27.595