| Year | Total phosphorus (µg/l) | TSI (TP) | Chlorophyll a (µg/l) | TSI (Chl) | Trophic state |
| 1993 | 418.4 | 91.3 | (Nil) | (Nil) | Eutrophic |
| 1994 | 752.9 | 99.71 | (Nil) | (Nil) | Eutrophic |
| 1995 | 1322.5 | 107.84 | 2126.35 | 105.63 | Eutrophic |
| 1996 | 1217.2 | 106.64 | 23442 | 129.27 | Eutrophic |
| 1997 | 963.3 | 103 | 28116.16 | 131.64 | Eutrophic |
| 1998 | 1667.2 | 111.18 | 22016 | 128.66 | Eutrophic |