| Covers listed |
|
| 1981: | 2 February, 6 April, 4 May, 22 June, |
| 1982: | 3 May, 24 May, 14 June, 28 June, 12 July, 23 August, 29 October, 19 November, 3 December, 27 December, |
| 1983: | 28 January, 18 February, 25 March, 15 April, 3 June, 30 June, 22 July, 19 August, 23 September, 28 October, |
| 1984: | March, April, September, October, |
| 1985: | Vol 88 No 7July, |
| 1986: | March, |
| 1988: | September/October, |
| 1989: | October, |
| 1990: | January, February, October, |
| 1991: | February, October/November, |
| 1992: | March, November, |
| 1993: | October-November, April, June, July, December, |
| 1995: | May, |
| 1996: | April/May, |
| 1997: | January/February, May, September, October, November, December, |
| 1998: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1999: | January, 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, |
| 2002: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 2003: | January, February, March, April, May, June, July, August, September, October, |
| 2004: | November, |
| 2005: | March, April, |
| 2006: | July, |
| 2007: | April, July, |
| 2008: | January, |
| 2009: | August, |
| 2010: | March, December, |
| 2011: | January, February, March, April, May, June, 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, December, January, |
| 2014: | February, March, April, May, 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, May, June, July, August, September, October, November, December, |
| 2018: | January, February, March, April, May, June, July, August, September, October, November, December, |
