| Covers listed |
|
| 1974: | #1 /December, |
| 1975: | January, February, March, April, May, June, July, August, September, October, November, Vol 1 No 12 December, |
| 1976: | January, Vol 2 No 2 February, March, April, May, June, Vol 2 No 7 July, August, September, October, November, December, |
| 1977: | Vol 3 No 1 January, February, March, April, Vol 3 No 5 May, June, July, August, September, October, November, December, |
| 1978: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1979: | January, February, March, April, May, May, June, July, August, September, October, November, Vol 5 No 12 December, |
| 1980: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1981: | January, February, March, April, May, June, July, August, September, September, October, November, December, |
| 1982: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1983: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1984: | January, February, March, April, May, May, June, July, August, September, October, November, December, |
| 1985: | January, February, March, April, Vol 11 No 5 May, Vol 11 # 6June, July, August, September, October, November, December, |
| 1986: | Vol 12 No 1 January, February, March, April, May, June, July, August, September, October, November, December, |
| 1987: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1988: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1989: | January, February, March, April, May, May, June, July, August, September, October, November, December, |
| 1990: | January, February, March, April, May, June, July, August, September, October, November, December, Special, |
| 1991: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1992: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1993: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1994: | January, February, March, April, May, June, July, August, September, October, November, December, Annual, |
| 1995: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1996: | January, January, February, March, April, May, June, July, August, September, October, November, December, |
| 1997: | January, February, March, April, May, June, July, 15 August, 31 August, 15 September, 30 September, 15 October, 31 October, 15 November, 30 November, 15 December, 31 December, Annual , |
| 1998: | 15 January, 31 January, 15 February, 28 February, 15 March, 31 March, 15 April, 30 April, 15 May, 31 May, 15 June, 30 June, 15 July, 31 July, 15 August, 31 August, 15 September, 30 September, 15 October, 31 October, 15 November, 15 November, 30 November, 15 December, Annual, 31 December, |
| 1999: | 15 January, 31 January, 15 February, 28 February, March, April, May, June, July, August, September, October, November, December, |
| 2000: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 2001: | January, February, March, April, May, June, July, August, September, October, November, December, Annual, Special , |
| 2002: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 2003: | January, February, March, April, May, June, July, August, September, October, November, December, Special, |
| 2004: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 2005: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 2006: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 2007: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 2008: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 2009: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 2010: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 2011: | January, March, April, May, July, August, September, October, November, December, |
| 2012: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 2013: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 2014: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 2015: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 2016: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 2017: | January, February, March/April, |
| 2019: | January, February, March, April, May, October, |
| 2020: | January, February, May, June/July, July/August, October, December, |
| 2021: | November/December, |
| 2022: | February/March, August/September, |
