When did the Federal Reserve switch from CPI to PCE?

PCE and CPI Inflation: What’s the Difference? at the Federal Reserve Bank of Cleveland:

The Federal Reserve, however, states its goal for inflation in terms of the PCE.

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Two Measures of Inflation and Fed Policy by Jill Mislinski:

The Fed is on record as using Core PCE data for its primary inflation gauge.

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I say CPI, you say PCE by Phil Davies. At the Federal Reserve Bank of Minneapolis:

The Fed switched from the CPI to the PCE in 2000.

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Now we know.