Year current US$ 2012 768647.134304047 2013 351371.64592742897 2014 573199.987411499 2015 666649.997234344 2016 1310580.0151825 2017 363339.990377426 2018 1165121.31690979 2019 1393249.98855591 2020 1887075.66261292 2021 1860700.01125336 2022 1242918.84899139