| 1980 | 1 | 2 | 3 | 4 |
| 1981 | 1 | 2 | 3 | 4 |
| 1982 | 1 | 2 | 3 | 4 |
| 1983 | 1 | 2 | 3 | 4 |
| 1984 | 1 | 2 | 3 | 4 |
| 1985 | 1 | 2 | 3 | 4 |
| 1986 | 1 | 2 | 3 | 4 |
| 1987 | 1 | 2 | 3 | 4 |
| 1988 | 1 | 2 | 3 | 4 |
| 1989 | 1 | 2 | 3 | 4 |
| 1990 | 1 | 2 | 3 | 4 |
| 1991 | 3 | |||
| 1992 | 1 | 2 | 3 | 4 |
| 1993 | 1 | 2 | 3 | 4 |
| 1994 | 1 | 2 | 3 | 4 |
| 1995 | 1(2) | 2 | 3 | 4 |
| 1996 | 1 | 2 | 3 | |
| 1997 | 1 | 2 | 3 | 4 |
| 1998 | 1 | 2 | 3 | 4 |
| 1999 | 1 | 2 | 3 | 4 |
| 2000 | 1 | 2 | 3 | 4 |
| 2001 | 1 | 2 | 3 | 4 |
| 2002 | 1 | 2 | 3 | 4 |
| 2003 | 1 | 2 | 3 | 4 |
| 2004 | 1 | 2 | 3 | 4 |
| 2005 | 1 | 2 | 3 | 4 |
| 2006 | 1 | 2 | 3 | 4 |
| 2007 | 1 | 2 | 3 | 4 |
| 2008 | 1 | 2 | 3 | 4 |
| 2009 | 1 | 2 | ||
| 2010 | 1 | 2 | 3 | 4 |
| 2011 | 1 | 2 | 3 | 4 |
| 2012 | 1 | 2 |
