Year current US$ 2011 10403268738.596615 2012 13388320912.01247 2013 13501026531.228937 2014 17490230289.745155 2015 19068164618.54089 2016 22997223127.765804 2017 25013724541.78831 2018 27946260449.936535 2019 27843861991.6965 2020 29206582044.716496 2021 27902884019.325436 2022 27324762612.16154 2023 31391379283.825043