Year current US$ 2012 80206.0142159462 2013 79588.0183577538 2014 72920.0020432472 2015 69459.99711751941 2016 179700.002074242 2017 84440.0003552437 2018 54682.247340679205 2019 2929.99995872378 2020 18234.7819209099 2021 59900.0006914139 2022 30966.0378843546