| Characteristic | 2016 | 2020 |
|---|---|---|
| - | - | - |
| - | - | - |
| - | - | - |
| - | - | - |
| - | - | - |
| - | - | - |
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Region
United States
Survey time period
as of 2017
Supplementary notes
Note: No exact publication date is given by the source.
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