| Characteristic | Number of mail boxes |
|---|---|
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
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Sources
Release date
October 2021
Region
China
Survey time period
2009 to 2020
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