Year Percent of GDP (Units) 1998 11.306 1999 9.311 2000 8.161 2001 7.475 2002 8.372 2003 7.077 2004 10.749 2005 7.460 2006 6.136 2007 5.931 2008 7.795 2009 18.398 2010 20.826 2011 20.926 2012 19.984 2013 18.292 2014 18.387 2015 18.177 2016 16.356 2017 14.531 2018 14.856 2019 16.472 2020 18.703 2021 18.693 2022 17.840 2023 19.411 2024 17.914 2025 16.805 2026 15.973 2027 15.642 2028 15.225 2029 14.659