| Year | Total | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
| 1999 | 10 | 10 | |||||||||||
| 1998 | 7 | 2 | 4 | 1 | |||||||||
| 1997 | 82 | 3 | 2 | 15 | 4 | 11 | 5 | 9 | 5 | 15 | 6 | 4 | 3 |
| 1996 | 67 | 6 | 6 | 12 | 8 | 4 | 11 | 6 | 1 | 9 | 1 | 3 | |
| 1995 | 21 | 1 | 1 | 2 | 2 | 2 | 2 | 3 | 5 | 1 | 2 | ||
| 1994 | 32 | 1 | 1 | 5 | 7 | 6 | 3 | 6 | 1 | 2 | |||
| 1993 | 50 | 5 | 7 | 5 | 6 | 5 | 4 | 7 | 5 | 5 | 1 | ||
| 1992 | 39 | 4 | 4 | 4 | 3 | 3 | 4 | 2 | 1 | 3 | 4 | 4 | 3 |
| 1991 | 40 | 3 | 3 | 4 | 4 | 5 | 4 | 4 | 3 | 3 | 4 | 2 | 1 |
| 1990 | 6 | 1 | 2 | 1 | 2 | ||||||||
| 1989 | - | ||||||||||||
| 1988 | 162 | 21 | 8 | 15 | 16 | 13 | 9 | 22 | 8 | 8 | 19 | 9 | 14 |
| 1987 | 163 | 26 | 12 | 15 | 21 | 16 | 9 | 23 | 10 | 12 | 18 | 1 | |
| 1986 | 173 | 27 | 12 | 15 | 23 | 2 | 25 | 14 | 10 | 25 | 9 | 11 | |
| 1985 | 208 | 26 | 11 | 17 | 22 | 19 | 16 | 28 | 15 | 15 | 24 | 14 | 1 |
| 1984 | 155 | 21 | 17 | 8 | 23 | 13 | 8 | 4 | 8 | 10 | 22 | 10 | 11 |
| 1983 | 182 | 18 | 14 | 10 | 26 | 16 | 8 | 20 | 15 | 8 | 26 | 9 | 12 |
| 1982 | 152 | 14 | 4 | 12 | 19 | 15 | 10 | 23 | 5 | 12 | 26 | 7 | 5 |
| 1981 | 172 | 17 | 17 | 7 | 28 | 7 | 11 | 22 | 12 | 6 | 25 | 8 | 12 |
| 1980 | 49 | 4 | 7 | 11 | 14 | 13 | |||||||
| 1979 | 112 | 23 | 25 | 14 | 15 | 12 | 18 | 4 | 1 | ||||
| 1978 | 57 | 4 | 6 | 4 | 2 | 2 | 1 | 4 | 20 | 14 | |||
| 1977 | 1 | 1 | |||||||||||
| 1940 |