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Release dates are determined by the following process:
When available, the actual release date as provided by the source is entered into the ALFRED database.
If a release date is not available from the source, the release date given by our data providers is used.
If a release date cannot be determined either from the source or from our data providers, the date that the series was first available in the St. Louis Fed's FRED database is used.
The release date list contains the dates when any series from this release was revised. Note that all series from a release do not necessarily revise on every release date.