Year current US$ 2012 237757629.39453098 2013 297992431.640625 2014 222564880.37109402 2015 285366302.49023396 2016 239386459.350586 2017 269315093.99414104 2018 226088897.705078 2019 279876983.642578 2020 214529953.00293 2021 253263076.78222698 2022 100917711.74781023