Year Percent of GDP (Units) 2005 10.409 2006 6.392 2007 2.590 2008 1.983 2009 9.668 2010 18.254 2011 20.713 2012 20.424 2013 19.594 2014 19.333 2015 18.714 2016 17.038 2017 17.554 2018 14.815 2019 10.826 2020 13.275 2021 15.348 2022 16.599 2023 16.456 2024 16.489 2025 16.465 2026 16.462 2027 16.380 2028 16.381 2029 16.407