Year	current US$
2011	750000000
2012	640000000
2013	680000000
2014	1076000000
2015	705000000
2016	713000000
2017	760000000
2018	1070000000
2019	1050000000
2020	595000000
2021	808000000
2022	1240000000
2023	1305000000