
| Characteristic | 2012 | 2013 | 2014 |
|---|---|---|---|
| - | - | - | - |
| - | - | - | - |
| - | - | - | - |
| - | - | - | - |
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Source
Release date
February 2015
Region
Worldwide
Survey time period
2012 to 2014
Age group
16 to 64 years
Supplementary notes
Question: "Which of the following have you used in the past month?"
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