| Year | Rank | Number |
| 2003 | 17531 | 5 |
| 2001 | 9868 | 10 |
| 2000 | 10461 | 9 |
| 1999 | 13878 | 6 |
| 1998 | 8391 | 11 |
| 1997 | 6393 | 15 |
| 1996 | 8621 | 10 |
| 1995 | 9293 | 9 |
| 1994 | 12887 | 6 |
| 1993 | 12899 | 6 |
| 1992 | 5197 | 19 |
| 1991 | 7788 | 11 |
| 1990 | 10988 | 7 |
| 1989 | 8506 | 9 |
| 1988 | 7498 | 10 |
| 1986 | 6430 | 11 |
| 1985 | 6777 | 10 |
| 1984 | 8790 | 7 |
| 1983 | 6533 | 10 |
| 1982 | 8846 | 7 |
| 1981 | 7167 | 9 |
| 1980 | 6179 | 11 |
| 1979 | 11310 | 5 |
| 1976 | 10319 | 5 |
| 1973 | 9306 | 5 |