Year Percent of GDP (Units) 2000 31.106 2001 32.369 2002 29.674 2003 30.856 2004 30.438 2005 31.363 2006 33.343 2007 31.518 2008 31.551 2009 32.050 2010 32.463 2011 32.441 2012 32.334 2013 32.477 2014 31.642 2015 31.937 2016 32.505 2017 31.163 2018 30.803 2019 30.066 2020 29.389 2021 27.813 2022 26.580 2023 28.358 2024 29.945 2025 29.743 2026 29.531 2027 29.533 2028 29.533 2029 29.507