| Non-Continuous Markets |
| | Winter 2021 | | January 2 - March 31 |
| | Spring 2021 | | April 1 - June 30 |
| | Summer 2021 | | June 1 - August 30 |
| | Fall 2021 | | September 1 - November 30 |
Starting September 2020, surveys are continuous
in most markets and compiled monthly. |
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