| Year | Rank | Number |
| 2011 | 10033 | 7 |
| 2008 | 13398 | 5 |
| 2007 | 10248 | 7 |
| 2005 | 9546 | 7 |
| 2003 | 11696 | 5 |
| 2002 | 8865 | 7 |
| 2001 | 9810 | 6 |
| 2000 | 11166 | 5 |
| 1996 | 7487 | 7 |
| 1995 | 8254 | 6 |
| 1994 | 6634 | 8 |
| 1992 | 9009 | 5 |
| 1991 | 7686 | 6 |
| 1990 | 7543 | 6 |
| 1988 | 7798 | 5 |
| 1987 | 5745 | 7 |
| 1986 | 7177 | 5 |
| 1984 | 5902 | 6 |
| 1983 | 5798 | 6 |
| 1977 | 5434 | 6 |
| 1972 | 4690 | 6 |
| 1971 | 3047 | 11 |
| 1967 | 3732 | 6 |
| 1966 | 2873 | 9 |
| 1964 | 3144 | 8 |