| Decade | Number of metro systems opened |
|---|---|
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
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Source
Release date
September 2018
Region
APAC
Survey time period
1920 to 2017
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