| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
| 1991 | 11 | 12 | 8 | 14 | 14 | 11 | 7 | 11 | 8 | 5 | 11 | 16 | 128 |
| 1992 | 15 | 12 | 10 | 4 | 9 | 8 | 6 | 6 | 5 | 4 | 14 | 18 | 111 |
| 1993 | 23 | 12 | 13 | 12 | 13 | 12 | 3 | 5 | 6 | 12 | 15 | 15 | 141 |
| 1994 | 12 | 5 | 7 | 7 | 12 | 10 | 6 | 11 | 7 | 9 | 8 | 10 | 104 |
| 1995 | 14 | 11 | 16 | 10 | 8 | 5 | 10 | 7 | 4 | 5 | 7 | 7 | 104 |
| 1996 | 8 | 5 | 10 | 5 | 3 | 12 | 9 | 9 | 9 | 4 | 7 | 9 | 90 |
| 1997 | 9 | 11 | 10 | 10 | 9 | 12 | 5 | 5 | 5 | 9 | 10 | 7 | 102 |
| 1998 | 11 | 13 | 8 | 6 | 1 | 4 | 3 | 9 | 7 | 8 | 10 | 14 | 94 |
| 1999 | 7 | 3 | 13 | 6 | 13 | 12 | 8 | 0 | 5 | 4 | 3 | 8 | 82 |
| 2000 | 7 | 9 | 12 | 10 | 9 | 13 | 3 | 5 | 6 | 7 | 16 | 14 | 111 |
| 2001 | 13 | 11 | 12 | 6 | 11 | 13 | 4 | 10 | 17 | 5 | 9 | 11 | 122 |
| 2002 | 6 | 6 | 11 | 6 | 10 | 11 | 12 | 9 | 7 | 15 | 9 | 11 | 113 |
| 2003 | 7 | 16 | 8 | 6 | 11 | 10 | 12 | 9 | 9 | 7 | 11 | 10 | 116 |
| 2004 | 14 | 13 | 17 | 12 | 6 | 19 | 5 | 8 | 7 | 13 | 17 | 9 | 140 |
| 2005 | 13 | 15 | 11 | 6 | 7 | 3 | 14 | 17 | 5 | 2 | 5 | 4 | 102 |
| 2006 | 10 | 14 | 9 | 5 | 6 | 7 | 9 | 5 | 5 | 8 | 8 | 14 | 100 |
| 2007 | 14 | 8 | 6 | 8 | 12 | 12 | 14 | 5 | 10 | 7 | 10 | 5 | 111 |
| 2008 | 12 | 14 | 10 | ||||||||||