I'm confused by the total supply of AMP. On the financial Google sheet, the "Available" amount is ~63,500,000 but the total "post burn" amount is ~950,000,000. My questions are how much is actually available to be traded over the life of the coin and what is the actual supply? All those omni wallets are confusing.

Then I look on coinmarketcap.com and it gives a supply of ~82,000,000.