| Year | Rank | Number |
| 2009 | 18420 | 5 |
| 2002 | 9812 | 10 |
| 1998 | 10525 | 8 |
| 1997 | 14730 | 5 |
| 1996 | 8441 | 10 |
| 1995 | 7244 | 12 |
| 1993 | 8314 | 10 |
| 1992 | 14188 | 5 |
| 1991 | 7626 | 11 |
| 1990 | 5653 | 16 |
| 1989 | 4414 | 21 |
| 1988 | 6025 | 13 |
| 1987 | 6071 | 12 |
| 1986 | 10039 | 6 |
| 1985 | 9803 | 6 |
| 1983 | 7569 | 8 |
| 1982 | 9677 | 6 |
| 1981 | 9551 | 6 |
| Year | Rank | Number |
| 2009 | 18420 | 5 |
| 2002 | 9812 | 10 |
| 1998 | 10525 | 8 |
| 1997 | 14730 | 5 |
| 1996 | 8441 | 10 |
| 1995 | 7244 | 12 |
| 1993 | 8314 | 10 |
| 1992 | 14188 | 5 |
| 1991 | 7626 | 11 |
| 1990 | 5653 | 16 |
| 1989 | 4414 | 21 |
| 1988 | 6025 | 13 |
| 1987 | 6071 | 12 |
| 1986 | 10039 | 6 |
| 1985 | 9803 | 6 |
| 1983 | 7569 | 8 |
| 1982 | 9677 | 6 |
| 1981 | 9551 | 6 |