| Characteristic | Total membership in millions |
|---|---|
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
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Region
United States
Survey time period
2011 to 2022
Supplementary notes
Values are as of December 31 each year.
Data prior to 2021 taken from previous editions.
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