| Year | Rank | Number |
| 2011 | 11353 | 9 |
| 2010 | 12536 | 8 |
| 2009 | 13958 | 7 |
| 2007 | 14261 | 7 |
| 2006 | 12674 | 8 |
| 2005 | 12105 | 8 |
| 1998 | 12861 | 6 |
| 1995 | 9810 | 8 |
| 1993 | 9791 | 8 |
| 1990 | 9476 | 8 |
| 1987 | 11737 | 5 |
| 1982 | 7011 | 9 |
| 1980 | 8344 | 7 |
| 1979 | 10565 | 5 |
| 1977 | 7719 | 7 |
| 1976 | 9628 | 5 |
| 1973 | 7646 | 6 |
| 1972 | 7482 | 6 |
| 1971 | 8614 | 5 |
| 1970 | 5483 | 9 |
| 1969 | 5124 | 9 |
| 1968 | 5753 | 7 |
| 1967 | 4363 | 10 |
| 1966 | 6796 | 5 |
| 1964 | 6969 | 5 |
| 1963 | 6029 | 6 |
| 1962 | 6012 | 6 |
| 1960 | 5293 | 7 |
| 1954 | 5936 | 5 |
| 1950 | 4862 | 6 |