Year Percent of GDP (Units) 2001 36.799 2002 41.691 2003 50.715 2004 51.746 2005 39.162 2006 29.943 2007 35.703 2008 54.219 2009 36.946 2010 56.938 2011 45.350 2012 38.206 2013 29.904 2014 28.015 2015 37.196 2016 31.686 2017 29.365 2018 22.763 2019 18.968 2020 17.374 2021 25.789 2022 32.869 2023 26.313 2024 27.290 2025 26.393 2026 26.306 2027 27.729 2028 27.304 2029 26.720