| Characteristic | 2017 | 2018 | 2019 | 2020 |
|---|---|---|---|---|
| - | - | - | - | - |
| - | - | - | - | - |
| - | - | - | - | - |
| - | - | - | - | - |
| - | - | - | - | - |
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Source
Release date
April 2020
Region
North America
Survey time period
2017 to 2020
Number of respondents
340 respondents
Method of interview
Email survey
Supplementary notes
Values prior to 2020 were taken from previous surveys.
2017 base: 272 respondents
2018 base: 417 respondents
2019 base: 508 respondents
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