| Year | Rank | Number |
| 1998 | 14559 | 5 |
| 1995 | 13808 | 5 |
| 1993 | 8850 | 9 |
| 1992 | 8853 | 9 |
| 1991 | 6306 | 14 |
| 1990 | 6930 | 12 |
| 1989 | 6599 | 12 |
| 1988 | 7206 | 10 |
| 1987 | 3998 | 21 |
| 1986 | 6663 | 10 |
| 1985 | 5396 | 13 |
| 1984 | 4348 | 17 |
| 1983 | 7408 | 8 |
| 1982 | 6968 | 9 |
| 1981 | 5295 | 13 |
| 1980 | 4540 | 16 |
| 1979 | 4647 | 15 |
| 1978 | 5608 | 11 |
| 1977 | 3777 | 19 |
| 1976 | 6111 | 9 |
| 1975 | 6032 | 9 |
| 1974 | 8972 | 5 |
| 1973 | 6766 | 7 |
| 1972 | 6644 | 7 |
| 1971 | 4573 | 12 |
| 1970 | 5878 | 8 |
| 1965 | 5898 | 6 |