Year U.S. Dollars 2015-01-01 22961700000 2016-01-01 22568200000 2017-01-01 23617200000 2018-01-01 26311500000 2019-01-01 27411200000 2020-01-01 28682600000 2021-01-01 30121700000 2022-01-01 31669900000 2023-01-01 33246300000