Alloy's block reward algorithm:
(MaximumSupply - AlreadyGeneratedCoins) >> EmissionCurveFactor
In other words,
0 generated: 80 XOA
21,000,000 generated: 60 XOA
42,000,000 generated: 40 XOA
63,000,000 generated: 20 XOA
84,000,000 generated: 0 XOA
and so on...
All blocks found are rewarded with transaction fees included...
So block reward and circulating supply is approximately as on the following image?