Year current US$ 2012 259143.02468299898 2013 495182.812213898 2014 267800.003290176 2015 350499.987602234 2016 746070.0273513789 2017 649330.019950867 2018 1104639.8878097502 2019 1537179.94689941 2020 2321580.41000366 2021 1806100.01087189 2022 1998199.9397277802