| Characteristic | 2014 | 2017 |
|---|---|---|
| - | - | - |
| - | - | - |
| - | - | - |
| - | - | - |
| - | - | - |
| - | - | - |
| - | - | - |
| - | - | - |
| - | - | - |
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Source
Release date
June 2015
Region
Worldwide
Survey time period
2014 and 2017
Supplementary notes
The figures for 2014 are estimates; the 2016 values are projections.
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