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| Study range | 1995 | 2000 | 2005 | 2010 | 2015 | 2020 |
|---|---|---|---|---|---|---|
| 2km | 20.3420 | 19.0334 | 19.4211 | 18.5320 | 18.3612 | 15.7601 |
| 4km | 20.6013 | 19.2803 | 19.6312 | 18.8223 | 18.6031 | 16.3023 |
| Hani Area | 21.2941 | 19.8140 | 20.1931 | 19.5034 | 19.2704 | 16.9242 |
