| Year | Total | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
| 1999 | 1 | 1 | |||||||||||
| 1998 | 13 | 8 | 4 | 1 | |||||||||
| 1997 | 6 | 3 | 1 | 2 | |||||||||
| 1996 | 2 | 2 | |||||||||||
| 1995 | 27 | 1 | 4 | 7 | 6 | 4 | 5 | ||||||
| 1994 | 64 | 9 | 6 | 15 | 1 | 8 | 1 | 8 | 8 | 4 | 4 | ||
| 1993 | 57 | 1 | 8 | 4 | 4 | 4 | 2 | 9 | 7 | 10 | 8 | ||
| 1992 | 175 | 8 | 17 | 20 | 17 | 16 | 20 | 11 | 10 | 19 | 11 | 16 | 10 |
| 1991 | 65 | 24 | 18 | 13 | 1 | 3 | 2 | 4 | |||||
| 1990 | 111 | 12 | 12 | 14 | 14 | 10 | 11 | 8 | 12 | 18 | |||
| 1989 | 129 | 6 | 5 | 8 | 10 | 16 | 9 | 14 | 10 | 10 | 13 | 11 | 17 |
| 1988 | 67 | 15 | 13 | 11 | 6 | 15 | 6 | 1 | |||||
| 1987 | 184 | 16 | 13 | 20 | 12 | 16 | 19 | 17 | 15 | 15 | 15 | 18 | 8 |
| 1986 | 52 | 2 | 6 | 5 | 3 | 1 | 2 | 4 | 4 | 3 | 10 | 12 | |
| 1985 | 127 | 11 | 15 | 20 | 7 | 12 | 6 | 6 | 14 | 12 | 12 | 6 | 6 |
| 1984 | 83 | 4 | 5 | 5 | 3 | 3 | 14 | 6 | 15 | 10 | 5 | 13 | |
| 1983 | 160 | 18 | 13 | 14 | 11 | 11 | 11 | 12 | 7 | 8 | 23 | 20 | 12 |
| 1982 | 163 | 26 | 27 | 14 | 6 | 10 | 11 | 14 | 11 | 19 | 13 | 12 | |
| 1981 | 284 | 14 | 23 | 26 | 26 | 29 | 27 | 15 | 24 | 26 | 30 | 27 | 17 |
| 1980 | 199 | 13 | 20 | 16 | 15 | 20 | 10 | 27 | 9 | 18 | 26 | 11 | 14 |
| 1979 | 21 | 1 | 1 | 1 | 4 | 14 | |||||||
| 1978 | 104 | 7 | 1 | 1 | 1 | 16 | 11 | 13 | 18 | 18 | 12 | 6 | |
| 1977 | 1 | 1 | |||||||||||
| 1976 | 83 | 16 | 12 | 5 | 4 | 5 | 7 | 1 | 6 | 23 | 4 | ||
| 1975 | 101 | 10 | 10 | 14 | 10 | 8 | 6 | 11 | 18 | 14 | |||
| 1974 | 14 | 1 | 3 | 2 | 4 | 4 | |||||||
| 1973 | 13 | 5 | 3 | 5 | |||||||||
| 2306 |