Year current US$ 2012 172493.249177933 2013 175417.616963387 2014 163240.000605583 2015 161679.998040199 2016 204490.005970001 2017 238409.99603271502 2018 178950.101137161 2019 159569.99361515002 2020 133104.04121875798 2021 130500.003695488 2022 108845.606446266