National Bank of Angola issued the following announcement on May 31.
The BNA announces that, in June 2019, foreign currency will be sold in the amount equivalent to USD 550,000,000.00 (Five Hundred and Fifty Million United States Dollars), by way of price and quantity auctions .
After each session, the BNA will disclose in its institutional portal the amount made available, the number of participants, the maximum and minimum exchange rates allowed, as well as the average exchange rate resulting from the session.
Original source can be found here.