
| Characteristic | Number of units in millions |
|---|---|
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
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Source
Release date
February 2022
Region
Worldwide
Survey time period
2012 to 2021
Supplementary notes
Figures have been rounded.
Figures for the period 2012 to 2020 come from earlier reports.
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