Year Percent of GDP (Units) 2000 8.506 2001 8.548 2002 13.896 2003 18.103 2004 25.088 2005 22.714 2006 19.839 2007 18.600 2008 26.622 2009 30.269 2010 29.886 2011 29.679 2012 30.226 2013 29.303 2014 27.714 2015 27.785 2016 28.481 2017 28.174 2018 29.463 2019 29.922 2020 33.453 2021 29.035 2022 28.888 2023 29.703 2024 29.786 2025 29.560 2026 29.433 2027 29.197 2028 29.116 2029 29.007