Year U.S. Dollars 2015-01-01 14362900000 2016-01-01 15916200000 2017-01-01 16984400000 2018-01-01 18336600000 2019-01-01 20059200000 2020-01-01 21937600000 2021-01-01 23906100000 2022-01-01 26021900000 2023-01-01 28317600000