The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.
DOE dates the authorisation to Bush's address of 16 January 1991 and the last of the 17.3 million barrels to 3 April 1991; the pin's exclusive end is the following midnight UTC.
Background on the drawdown authorities: a full drawdown, a limited drawdown of up to 30 million barrels, or a test sale.[1]
The White House statement that authorised the drawdown, on the night of 16 January 1991: it names Secretary Watkins, cites the Energy[1][2] Policy and Conservation Act and ties the release to the IEA's agreed emergency response plan.
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