| Year | Total | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
| 2000 | 7 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | |||||
| 1999 | 8 | 1 | 1 | 2 | 2 | 2 | |||||||
| 1998 | 42 | 8 | 3 | 6 | 8 | 5 | 1 | 1 | 2 | 1 | 5 | 2 | |
| 1997 | 81 | 10 | 12 | 1 | 10 | 5 | 8 | 6 | 15 | 3 | 8 | 3 | |
| 1996 | 70 | 6 | 1 | 10 | 8 | 5 | 10 | 6 | 11 | 9 | 4 | ||
| 1995 | 50 | 5 | 6 | 1 | 4 | 7 | 7 | 1 | 4 | 1 | 11 | 3 | |
| 1994 | 89 | 2 | 3 | 7 | 6 | 8 | 2 | 12 | 9 | 10 | 17 | 7 | 6 |
| 1993 | 51 | 4 | 5 | 3 | 4 | 6 | 5 | 10 | 7 | 3 | 3 | 1 | |
| 1992 | 46 | 4 | 4 | 4 | 3 | 9 | 4 | 1 | 1 | 2 | 4 | 5 | 5 |
| 1991 | 43 | 3 | 3 | 4 | 4 | 4 | 4 | 5 | 6 | 3 | 4 | 2 | 1 |
| 1990 | 35 | 17 | 2 | 6 | 1 | 2 | 2 | 1 | 4 | ||||
| 1989 | 38 | 1 | 5 | 6 | 17 | 1 | 8 | ||||||
| 1988 | 57 | 3 | 1 | 1 | 1 | 8 | 22 | 1 | 1 | 12 | 7 | ||
| 1987 | 75 | 1 | 7 | 16 | 1 | 1 | 1 | 7 | 17 | 1 | 17 | 6 | |
| 1986 | 163 | 22 | 5 | 8 | 14 | 20 | 9 | 21 | 14 | 15 | 11 | 14 | 10 |
| 1985 | 163 | 14 | 14 | 18 | 15 | 12 | 17 | 14 | 7 | 3 | 23 | 15 | 11 |
| 1984 | 123 | 15 | 17 | 14 | 17 | 1 | 1 | 1 | 20 | 20 | 17 | ||
| 1983 | 80 | 18 | 1 | 13 | 16 | 15 | 1 | 1 | 15 | ||||
| 1982 | 215 | 14 | 10 | 20 | 21 | 18 | 22 | 24 | 21 | 14 | 27 | 11 | 13 |
| 1981 | 119 | 20 | 6 | 8 | 8 | 6 | 7 | 14 | 13 | 12 | 12 | 5 | 8 |
| 1980 | 131 | 10 | 16 | 17 | 10 | 12 | 10 | 9 | 5 | 4 | 20 | 8 | 10 |
| 1979 | 108 | 9 | 4 | 6 | 3 | 5 | 4 | 5 | 11 | 19 | 17 | 14 | 11 |
| 1978 | 61 | 6 | 4 | 5 | 5 | 5 | 3 | 7 | 3 | 1 | 1 | 21 | |
| 1977 | 73 | 1 | 3 | 5 | 2 | 9 | 15 | 7 | 5 | 3 | 7 | 9 | 7 |
| 1976 | 173 | 23 | 7 | 11 | 26 | 21 | 13 | 22 | 14 | 11 | 21 | 1 | 3 |
| 1975 | 196 | 24 | 6 | 10 | 23 | 16 | 15 | 19 | 13 | 14 | 26 | 16 | 14 |
| 1974 | 138 | 8 | 5 | 13 | 13 | 13 | 16 | 16 | 18 | 18 | 9 | 9 | |
| 1973 | 76 | 1 | 1 | 1 | 5 | 1 | 14 | 9 | 9 | 17 | 8 | 10 | |
| 1972 | 22 | 4 | 2 | 4 | 10 | 2 | |||||||
| 1971 | 6 | 1 | 1 | 4 | |||||||||
| 2539 |
