| Year | Total | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
| 2005 | 1 | 1 | |||||||||||
| 2004 | 16 | 1 | 1 | 3 | 3 | 4 | 2 | 2 | |||||
| 2003 | 15 | 1 | 2 | 3 | 1 | 2 | 1 | 2 | 1 | 2 | |||
| 2002 | 2 | 2 | |||||||||||
| 2001 | 3 | 3 | |||||||||||
| 2000 | 61 | 5 | 13 | 8 | 1 | 2 | 5 | 6 | 8 | 4 | 3 | 4 | 2 |
| 1999 | 118 | 1 | 7 | 4 | 8 | 10 | 14 | 17 | 17 | 6 | 11 | 12 | 11 |
| 1998 | 75 | 11 | 14 | 11 | 5 | 1 | 1 | 8 | 16 | 8 | |||
| 1997 | 136 | 13 | 13 | 5 | 9 | 11 | 15 | 13 | 15 | 15 | 13 | 4 | 10 |
| 1996 | 160 | 5 | 12 | 14 | 19 | 13 | 18 | 13 | 14 | 14 | 15 | 16 | 7 |
| 1995 | 25 | 1 | 3 | 7 | 6 | 8 | |||||||
| 1994 | 24 | 2 | 4 | 4 | 2 | 1 | 4 | 3 | 4 | ||||
| 1993 | 105 | 8 | 12 | 16 | 10 | 3 | 13 | 8 | 6 | 5 | 9 | 8 | 7 |
| 1992 | 32 | 1 | 2 | 1 | 1 | 3 | 13 | 11 | |||||
| 1991 | 14 | 2 | 6 | 1 | 3 | 2 | |||||||
| 1990 | 48 | 2 | 2 | 5 | 4 | 7 | 4 | 4 | 2 | 3 | 5 | 8 | 2 |
| 1989 | 20 | 2 | 1 | 2 | 7 | 2 | 6 | ||||||
| 855 |