| 1967 | 800 |
| 1968 | 500 |
| 1969 | 475 |
| 1970 | 250 |
| 1971 | 225 |
| 1972 | 190 |
| 1973 | 185 |
| 1974 | 185 |
| 1975 | 135 |
| 1976 | 110 |
| 1977 | 90 |
| 1978 | 120 |
| 1979 | 120 |
| 1980 | 120 |
| 1981 | 320 |
| 1982 | 195 |
| 1983 | 220 |
| 1984 | 220 |
| 1985 | 225 |
| 1986 | 275 |
| 1987 | 370 |
| 1988 | 370 |
| 1989 | 570 |
| 1990 | 590 |
| 1991 | 330 |
| 1992 | 365 |
| 1993 | 365 |
| 1994 | 390 |
| 1995 | 430 |
| 1996 | 430 |
| 1997 | 755 |
| 1998 | 765 |
| 1999 | 835 |
| 2000 | 835 |
| 2001 | 815 |
| 2002 | 825 |
| 2003 | 835 |
| 2004 | 835 |
| 2005 | 765 |
| 2006 | 745 |
| 2007 | 845 |
| 2008 | 875 |
| 2009 | 945 |
| 2010 | 935 |
| 2011 | 945 |
| 2012 | 945 |
| 2013 | 1 065 |
| 2014 | 1 065 |
| 2015 | 1 065 |
| 2016 | 1 065 |
| 2017 | 1 065 |
| 2018 | 1 070 |
| 2019 | 1 120 |