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Quarterly updates contains revisions and initial data releases as indicated below.
| Release month |
Description |
| January |
Contains revised first quarter data and initial second
quarter data of the prior year.
(For example the update in January 2009
contains revised 1st quarter data for 2008 and initial 2nd quarter data
for 2008.)
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| April |
Contains revised first and second quarter data and initial
third quarter data of the prior year.
(For example the update in April 2009
contains revised 1st and 2nd quarter data for 2008,
and initial 3rd quarter data for 2008.)
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| July |
Contains revised first, second and third quarter data, and initial fourth
quarter data of the prior year.
(For example the update in July 2009
contains revised 1st, 2nd and 3rd quarter data for 2008,
and initial 4th quarter data for 2008.)
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| October |
Contains revised quarterly data of the prior year, and initial first
quarter data of the current year.
(For example the update in October 2009
contains revised quarterly data for 2008,
and initial 1st quarter data for 2009.)
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