| Year | Rank | Number |
| 2010 | 12699 | 5 |
| 2005 | 10410 | 6 |
| 2003 | 11307 | 5 |
| 1999 | 8987 | 6 |
| 1998 | 7775 | 7 |
| 1997 | 7480 | 7 |
| 1995 | 8054 | 6 |
| 1994 | 7155 | 7 |
| 1993 | 5096 | 11 |
| 1992 | 7684 | 6 |
| 1991 | 5613 | 9 |
| 1990 | 4465 | 12 |
| 1989 | 7205 | 6 |
| 1988 | 4521 | 10 |
| 1985 | 6798 | 5 |
| 1980 | 5053 | 7 |
| 1977 | 6076 | 5 |
| Year | Rank | Number |
| 2010 | 12699 | 5 |
| 2005 | 10410 | 6 |
| 2003 | 11307 | 5 |
| 1999 | 8987 | 6 |
| 1998 | 7775 | 7 |
| 1997 | 7480 | 7 |
| 1995 | 8054 | 6 |
| 1994 | 7155 | 7 |
| 1993 | 5096 | 11 |
| 1992 | 7684 | 6 |
| 1991 | 5613 | 9 |
| 1990 | 4465 | 12 |
| 1989 | 7205 | 6 |
| 1988 | 4521 | 10 |
| 1985 | 6798 | 5 |
| 1980 | 5053 | 7 |
| 1977 | 6076 | 5 |