Year Percent of GDP (Units) 2004 91.450 2005 63.205 2006 50.319 2007 43.979 2008 57.254 2009 61.095 2010 49.575 2011 43.369 2012 42.892 2013 48.249 2014 43.783 2015 43.464 2016 42.526 2017 35.071 2018 31.538 2019 35.264 2020 42.176 2021 37.098 2022 37.403 2023 43.853 2024 47.662 2025 47.203 2026 46.914 2027 46.729 2028 46.412 2029 46.151