| Year | Rank | Number |
| 2011 | 15429 | 6 |
| 2010 | 12684 | 8 |
| 2009 | 10138 | 11 |
| 2008 | 11903 | 9 |
| 2007 | 13082 | 8 |
| 2006 | 11761 | 9 |
| 2005 | 15173 | 6 |
| 2002 | 14231 | 6 |
| 1999 | 13266 | 6 |
| 1988 | 10832 | 6 |
| 1982 | 11075 | 5 |
| 1977 | 10167 | 5 |
| 1975 | 7421 | 7 |
| 1971 | 6856 | 7 |
| 1967 | 6286 | 6 |
| 1966 | 5021 | 8 |
| Year | Rank | Number |
| 2011 | 15429 | 6 |
| 2010 | 12684 | 8 |
| 2009 | 10138 | 11 |
| 2008 | 11903 | 9 |
| 2007 | 13082 | 8 |
| 2006 | 11761 | 9 |
| 2005 | 15173 | 6 |
| 2002 | 14231 | 6 |
| 1999 | 13266 | 6 |
| 1988 | 10832 | 6 |
| 1982 | 11075 | 5 |
| 1977 | 10167 | 5 |
| 1975 | 7421 | 7 |
| 1971 | 6856 | 7 |
| 1967 | 6286 | 6 |
| 1966 | 5021 | 8 |