Year current US$ 2012 271174.520254135 2013 273218.661546707 2014 165350.005030632 2015 147369.995713234 2016 142959.99705791502 2017 230700.001120567 2018 112053.498625755 2019 553099.989891052 2020 442728.102207184 2021 475930.005311966 2022 422481.417655945