| Characteristic | Number of users in millions |
|---|---|
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
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Source
Release date
March 2018
Region
United States
Survey time period
2001 to 2017
Number of respondents
110,000 respondents
Special properties
U.S. adults
Supplementary notes
* Number of users as of December each year.
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