• Vol. 20 (2002)
• No. 19 (2001)
• No. 18 (2000)
• No. 17 (1999)
• No. 16 (1998)
• No. 15 (1997)
• No. 14 (1996)
• No. 13 (1995)
• No. 12 (1994)
• No. 11 (1993)
• No 10 (1991/92)
• No. 9 (1990)
• No. 8 (1989)
• No. 7 (1988)
• No. 6 (1987)
• No. 5 (1986)
• No. 4 (1985)
• No. 3 (1984)
• No. 2 (1983)
• No. 1 (1982)