| Characteristic | Low estimate | High estimate |
|---|---|---|
| - | - | - |
| - | - | - |
| - | - | - |
| - | - | - |
| - | - | - |
| - | - | - |
| - | - | - |
| - | - | - |
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Sources
Release date
August 2015
Region
Worldwide
Survey time period
2015
Supplementary notes
Adjusted to 2015 dollars.
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