| Year | Volume | Number | Holdings | ||
|---|---|---|---|---|---|
| 2001/2003 | 13 | 1 -6 | Yes | ||
| 2000/2001 | 12 | 1 -6 | Yes | ||
| 1998/1999 | 11 | 1 -6 | No | ||
| 1997/1998 | 10 | 1 -6 | Yes | ||
| 1996/1997 | 9 | 1 -6 | Yes | ||
| 1995 | 8 | 1 -6 | Yes | ||
| 1994 | 7 | 1 -4 | Yes | ||
| 1993 | 6 | 1 -4 | Yes | ||
| 1992 | 5 | 4 | Yes | ||
| 1992 | 5 | 3 | No | ||
| 1992 | 5 | 1 -2 | Yes | ||
| 1991 | 4 | 2 -4 | Yes | ||
| 1991 | 4 | 1 | No | ||
| 1990 | 3 | 1 -4 | Yes | ||
| 1989 | 2 | 3 -4 | Yes | ||
| 1989 | 2 | 2 | No | ||
| 1989 | 2 | 1 | Yes | ||
| 1988 | 1 | 4 | No | ||
| 1988 | 1 | 1 -3 | Yes |