Revenue should be reported in any company's Annual Report. It may also be possible to find this information in other sources. Any source is acceptable, but in case of discrepancy the official Annual Report should be taken as the correct answer.

Where a company reports revenue for their financial year, which differs from the calander year, the answer should be assigned to the earlier year. So for example if a company's annual report runs from September 2016 - September 2017 the year should be 2016.

The Monetary unit for this metric is US Dollars. If the value is reported in a currency other than US dollars, please consult convert to USD, and add conversion details in the comments section. The following website provides yearly average conversion rates: https://www.ofx.com/en-gb/forex-news/historical-exchange-rates/yearly-average-rates/