Year current US$ 2011 779999.971389771 2012 572104.811668396 2013 649475.157260895 2014 631941.795349121 2015 724606.990814209 2016 504387.97473907506 2017 742078.66191864 2018 455261.677503586 2019 857489.7050857539 2020 528060.019016266 2021 933300.018310547 2022 530423.045158386