| Year | Rank | Number |
| 1998 | 15187 | 5 |
| 1992 | 12410 | 6 |
| 1989 | 13248 | 5 |
| 1984 | 8521 | 7 |
| 1983 | 10943 | 5 |
| 1981 | 11065 | 5 |
| 1978 | 10393 | 5 |
| 1977 | 7148 | 8 |
| 1975 | 8408 | 6 |
| 1972 | 5655 | 9 |
| 1971 | 7746 | 6 |
| 1970 | 6018 | 8 |
| 1969 | 5650 | 8 |
| 1967 | 5682 | 7 |
| 1966 | 6097 | 6 |
| 1965 | 6091 | 6 |
| 1964 | 5703 | 7 |
| 1960 | 6770 | 5 |
| 1959 | 5255 | 7 |
| 1956 | 5569 | 6 |
| 1953 | 5316 | 6 |
| 1948 | 5599 | 5 |