Question: Does this expose the data to calculate total unlocked tokens at any given block?

[lsaether]

I'm looking for a data feed that can give me the total unlocked tokens at any given block. Essentially this would be the total issuance which can be queried from the chain state minus tokens locked for governance, tokens locked for vesting, tokens staked, and eventually tokens locked in parachain slots. The last four items would need to be queried on each account individually, which could be quite a long loading time. Does Polkascan track or expose any of this data?