| Characteristic | Number in millions |
|---|---|
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
The chart is not accessible to screen readers. Please switch to the table view to access the data.
Download
Region
Worldwide
Survey time period
2009 to 2011
Supplementary notes
* The figures from 2012 to 2017 are projections.
Citation formats








