| Year | Rank | Number |
| 2005 | 13959 | 7 |
| 2004 | 11292 | 9 |
| 1999 | 15997 | 5 |
| 1997 | 15265 | 5 |
| 1996 | 10194 | 8 |
| 1995 | 14925 | 5 |
| 1993 | 11329 | 7 |
| 1992 | 7849 | 11 |
| 1991 | 14559 | 5 |
| 1989 | 13739 | 5 |
| 1988 | 9948 | 7 |
| 1987 | 12504 | 5 |
| 1986 | 12081 | 5 |
| 1985 | 7331 | 9 |
| 1984 | 11502 | 5 |
| 1983 | 9768 | 6 |
| 1982 | 11596 | 5 |
| 1981 | 7855 | 8 |
| 1980 | 7156 | 9 |
| 1979 | 6010 | 11 |
| 1978 | 8199 | 7 |
| 1977 | 4815 | 14 |
| 1976 | 5441 | 11 |
| 1975 | 7653 | 7 |
| 1972 | 9101 | 5 |