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| Year | Number of birds | # + EEE | # + SLE |
| 1988 | na | 4 | 6 |
| 1989 | na | 2 | 81 |
| 1990 | 1062 | 2 | 407 |
| 1991 | 794 | 15 | 23 |
| 1992 | 881 | 8 | 2 |
| 1993 | 844 | 1 | 100 |
| 1994 | 904 | 6 | 31 |
| 1995 | 1017 | 5 | 25 |
| 1996 | 1048 | 10 | 7 |
| 1997 | 1002 | 2 | 269 |
| 1998 | 1112 | 4 | 84 |
| 1999 | 1062 | 6 | 100 |
| Average (1998-98) | 5.4 | 94.1 | |
| Median (1998-98) | 4.0 | 31.0 | |