Year Percent of GDP (Units) 1996 20.442 1997 20.581 1998 21.799 1999 24.829 2000 24.351 2001 26.836 2002 25.296 2003 25.352 2004 22.404 2005 22.115 2006 21.251 2007 22.148 2008 21.858 2009 23.270 2010 23.437 2011 23.637 2012 22.261 2013 23.966 2014 24.969 2015 27.927 2016 27.649 2017 27.661 2018 26.850 2019 27.468 2020 33.146 2021 25.776 2022 22.966 2023 23.702 2024 23.889 2025 24.276 2026 24.332 2027 24.286 2028 24.274 2029 24.223