Year current US$ 2012 175278.276205063 2013 310111.612081528 2014 238340.00527858702 2015 186710.000038147 2016 117990.002036095 2017 226390.00415802 2018 567269.861698151 2019 632920.026779175 2020 264985.501766205 2021 345400.005578995 2022 72356.216609478