| Characteristic | Number in millions |
|---|---|
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| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
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Source
Release date
August 2011
Region
Worldwide
Survey time period
1995 to 2011
Supplementary notes
* January through August.
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