Year Percent of GDP (Units) 2006 33.447 2007 36.897 2008 40.764 2009 46.508 2010 48.339 2011 49.997 2012 53.732 2013 52.308 2014 54.546 2015 52.736 2016 49.877 2017 51.178 2018 52.419 2019 48.803 2020 50.193 2021 48.874 2022 16.747 2023 16.966 2024 17.238 2025 17.406 2026 17.496 2027 17.290 2028 16.582 2029 15.902