| 2012 Volume 28 | N1 | N2 | N3 | N4 | N5 | N6 | N2suppl | |||
| 2011 Volume 27 | N1 | N2 | N3 | N4 | N5 | N6 | N2suppl | |||
| 2010 Volume 26 | N1 | N2 | N3 | N4 | N5 | N6 | N2suppl | |||
| 2009 Volume 25 | N1 | N2 | N3 | N4 | N5 | N6 | ||||
| 2008 Volume 24 | N1 | N2 | N3 | N4 | N5 | N6 | ||||
| 2007 Volume 23 | N1 | N2 | N3 | N4 | N5 | N6 | ||||
| 2006 Volume 22 | N1 | N2 | N3 | N4 | N5 | N6 | ||||
| 2005 Volume 21 | N1 | N2 | N3 | N4 | N5 | N6 | ||||
| 2004 Volume 20 | N1–2 | N3 | N4 | N5 | N6 | |||||
| 2003 Volume 19 | N1 | N2 | N3 | N4 | N5 | N6 | ||||
| 2002 Volume 18 | N1 | N2 | N3 | N4 | N5 | N6 | ||||
| 2001 Volume 17 | N1 | N2 | N3 | N4 | N5 | N6 | ||||
| 2000 Volume 16 | N1 | N2 | N3 | N4 | N5 | N6 | ||||
| 1999 Volume 15 | N1 | N2 | N3 | N4 | N5 | N6 | ||||
| 1998 Volume 14 | N1 | N2 | N3 | N4 | N5 | N6 | ||||
| 1997 Volume 13 | N1 | N2 | N3 | N4 | N5 | N6 | ||||
| 1996 Volume 12 | N1 | N2 | N3 | N4 | N5 | N6 | ||||
| 1995 Volume 11 | N1 | N2 | N3–4 | N5 | N6 | |||||
| 1994 Volume 10 | N1 | N2 | N3–4 | N5 | N6 | |||||
| 1993 Volume 9 | N1 | N2 | N3 | N4 | N5 | N6 | ||||
| 1992 Volume 8 | N1 | N2 | N3 | N4 | N5 | N6 | ||||
| 1991 Volume 7 | N1 | N2 | N3 | N4 | N5 | N6 | ||||
| 1990 Volume 6 | N1 | N2 | N3 | N4 | N5 | N6 | ||||
| 1989 Volume 5 | N1 | N2 | N3 | N4 | N5 | N6 | ||||
| 1988 Volume 4 | N1 | N2 | N3 | N4 | N5 | N6 | ||||
| 1987 Volume 3 | N1 | N2 | N3 | N4 | N5 | N6 | ||||
| 1986 Volume 2 | N1 | N2 | N3 | N4 | N5 | N6 | ||||
| 1985 Volume 1 | N1 | N2 | N3 | N4 | N5 | N6 | ||||