| Location | Month | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 |
|---|---|---|---|---|---|---|---|
| YELL2 | 1 | 6 | 0 | 9 | 5 | 12 | 3 |
| YELL2 | 2 | 6 | 0 | 6 | 7 | 10 | 10 |
| YELL2 | 3 | 9 | 0 | 8 | 7 | 10 | 10 |
| YELL2 | 4 | 9 | 7 | 7 | 8 | 11 | 10 |
| YELL2 | 5 | 8 | 8 | 6 | 7 | 12 | 10 |
| YELL2 | 6 | 8 | 4 | 8 | 8 | 6 | 9 |
| YELL2 | 7 | 9 | 9 | 9 | 9 | 11 | 10 |
| YELL2 | 8 | 9 | 8 | 8 | 4 | 9 | 10 |
| YELL2 | 9 | 7 | 8 | 9 | 9 | 8 | 10 |
| YELL2 | 10 | 8 | 8 | 9 | 6 | 10 | 9 |
| YELL2 | 11 | 7 | 7 | 8 | 10 | 10 | 9 |
| YELL2 | 12 | 0 | 7 | 5 | 9 | 6 | 11 |