Year Percent of GDP (Units) 2000 30.112 2001 35.022 2002 48.763 2003 35.240 2004 33.978 2005 26.628 2006 19.027 2007 14.314 2008 12.702 2009 11.095 2010 8.430 2011 6.701 2012 8.800 2013 9.914 2014 10.933 2015 14.758 2016 15.587 2017 15.951 2018 18.436 2019 22.666 2020 32.247 2021 33.254 2022 36.832 2023 36.946 2024 39.937 2025 38.723 2026 38.409 2027 37.906 2028 37.176 2029 36.238