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SN74HCT74: When was Sn terminal finish added?

Part Number: SN74HCT74

Per the current webpage for this part, the SN74HCT74DR has NiPdAu and Sn finish.  I searched our PCN archive and an online archive, but can't find a PCN that says Sn finish was added for this part.

Back in 2008 there was a PCN that said this part was made in Malaysia and had a gold finish.  In 2011, another PCN said the same.  Then there was PCN 20211220002.1, but this part was in Group 2 which only included changes to the Bond Wire, Mount Compound, and Mold Compound.

Which PCN announced the addition of the tin terminal finish?  Could you provide a download link?

Thank you.

Bill