Year U.S. dollars (Billions) 2014 -0.083 2015 -0.106 2016 -0.094 2017 -0.129 2018 -0.149 2019 -0.126 2020 -0.168 2021 -0.162 2022 -0.136 2023 -0.198 2024 -0.239 2025 -0.199 2026 -0.195 2027 -0.189 2028 -0.191 2029 -0.194