| 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | |
|---|---|---|---|---|---|---|---|
| Bhutan | ‐ | ‐ | 23.49 | 20.22 | 23.41 | 22.38 | ‐ |
| Nepal a | 24.86 | 21.28 | 28.84 | 27.01 | 31.10 | 32.75 | 23.63 |
| Sri Lanka | ‐ | ‐ | 31.15 | 51.20 | 49.14 | 46.96 | 35.83 |
a2018 data include only federal level data.
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