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Record

Derived annual production year to March 2018-year to March 2021, year to March 2018, 19, 20, 21

2.1, 1.5, 3.2, 3.7 billions Year to March 2018, 19, 20, 21

ReportedReported by a reliable secondary source, or read carefully from filed documents.

Found in one pass only. The research team reads every source twice, independently; this record turned up in one reading but not the other, so treat it as less certain than its grade.