| Year | Rank | Number |
| 2011 | 17553 | 5 |
| 2010 | 17824 | 5 |
| 2007 | 13039 | 8 |
| 2003 | 14437 | 6 |
| 1999 | 7372 | 13 |
| 1998 | 11520 | 7 |
| 1997 | 14470 | 5 |
| 1996 | 14232 | 5 |
| 1995 | 9870 | 8 |
| 1993 | 8259 | 10 |
| 1992 | 8969 | 9 |
| 1991 | 5491 | 17 |
| 1990 | 6586 | 13 |
| 1989 | 4922 | 18 |
| 1988 | 5990 | 13 |
| 1987 | 6951 | 10 |
| 1986 | 7969 | 8 |
| 1984 | 9484 | 6 |
| 1982 | 10989 | 5 |
| 1953 | 4717 | 7 |