History of Staker Registration

Hi there,
We are currently analyzing the Algorand blockchain and have a question regarding “keyreg” transactions.
We are working with a subset of data from the beginning until blockround 15’000’000.
Surprisingly, we count only 1’260 "key"registration transactions, but around 800’000 stakers received rewards.
Does anyone know how this mismatch / discrepancy is generated? Was there a change in the “keyreg” process?
Thank you for your contribution.

There is no rewards for participating / staking on Algorand.
Participation rewards were distributed to all accounts whether they participated or not in the consensus.
See How Algorand Rewards Distribution Works | PureStake

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