| Location | Month | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 |
|---|---|---|---|---|---|---|---|
| GLAC1 | 1 | 8 | 9 | 9 | 9 | 10 | 9 |
| GLAC1 | 2 | 8 | 6 | 8 | 8 | 4 | 10 |
| GLAC1 | 3 | 8 | 8 | 9 | 8 | 9 | 7 |
| GLAC1 | 4 | 9 | 9 | 8 | 0 | 10 | 9 |
| GLAC1 | 5 | 8 | 8 | 8 | 9 | 11 | 10 |
| GLAC1 | 6 | 8 | 8 | 8 | 8 | 8 | 10 |
| GLAC1 | 7 | 8 | 8 | 8 | 9 | 5 | 8 |
| GLAC1 | 8 | 8 | 9 | 8 | 9 | 9 | 7 |
| GLAC1 | 9 | 8 | 7 | 9 | 10 | 7 | 6 |
| GLAC1 | 10 | 9 | 7 | 8 | 10 | 11 | 2 |
| GLAC1 | 11 | 9 | 7 | 8 | 10 | 10 | 8 |
| GLAC1 | 12 | 9 | 9 | 9 | 9 | 6 | 11 |