| Characteristic | Annual variation |
|---|---|
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
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Sources
Release date
January 2019
Region
Worldwide
Survey time period
2011 - 2017
Supplementary notes
** forecast.
The figures for the years 2011 to 2017 are included in the reports previously published by the source.
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