PCGS also maintains a similar database, although the numbers will only be valid for slabbed coins, generally PF 66 and above. For lower grades or impaired proofs, the value will be between 1-3x face value generally; that's why so many get dumped into circulation.
PCGS price guide has proofs split out into separate sections under denomination and series; individual years then have auction results beneath, although these might reflect only PCGS slabbed coins, not sure. https://www.PCGS.com/prices/
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