Year Purchasing power parity; international dollars (Billions) 2011 18.810 2012 14.577 2013 13.593 2014 16.035 2015 19.170 2016 21.529 2017 23.162 2018 24.402 2019 25.712 2020 25.384 2021 27.426 2022 30.072 2023 32.040 2024 34.027 2025 35.978 2026 38.122 2027 40.435 2028 42.971 2029 45.762