Year Percent of GDP (Units) 2011 0.000 2012 8.906 2013 17.587 2014 38.141 2015 57.243 2016 125.581 2017 117.592 2018 69.177 2019 42.833 2020 49.284 2021 52.218 2022 39.922 2023 54.129 2024 48.252 2025 42.107 2026 37.714 2027 33.918 2028 28.981 2029 21.257