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| Study range | 1995 | 2000 | 2005 | 2010 | 2015 | 2020 |
|---|---|---|---|---|---|---|
| 2km | 8.5532 | 8.4321 | 8.4224 | 8.4203 | 8.3034 | 8.3102 |
| 4km | 8.5811 | 8.4710 | 8.4632 | 8.4612 | 8.3541 | 8.3432 |
| Hani Area | 8.7424 | 8.6841 | 8.6701 | 8.6731 | 8.6121 | 8.5522 |
