| Year | Rank | Number |
| 2010 | 13706 | 5 |
| 2009 | 8058 | 10 |
| 2008 | 14047 | 5 |
| 2005 | 8881 | 8 |
| 2004 | 7996 | 9 |
| 2003 | 10517 | 6 |
| 2002 | 10315 | 6 |
| 2001 | 11836 | 5 |
| 2000 | 11683 | 5 |
| 1998 | 10850 | 5 |
| 1997 | 7901 | 7 |
| 1996 | 10117 | 5 |
| 1995 | 6276 | 9 |
| 1974 | 4506 | 7 |
| 1973 | 4389 | 7 |
| 1971 | 5460 | 5 |
| 1966 | 4361 | 5 |
| 1960 | 3569 | 7 |
| 1959 | 4416 | 5 |
| 1958 | 3487 | 7 |
| 1957 | 2343 | 13 |
| 1955 | 3790 | 6 |
| 1954 | 3720 | 6 |
| 1953 | 3358 | 7 |
| 1950 | 4067 | 5 |
| 1947 | 3033 | 8 |
| 1946 | 3434 | 6 |
| 1940 | 3376 | 6 |
| 1937 | 3892 | 5 |