| Covers listed | |
| 1979: | #1 / February, |
| 1980: | March, September, December, |
| 1981: | August, |
| 1982: | June, July, October, December, |
| 1983: | July, October, |
| 1984: | January, August, October, |
| 1985: | April, September, |
| 1986: | July, September, |
| 1987: | January, November, |
| 1988: | January, February, |
| 1990: | April, August, September, November, December, |
| 1991: | January, May, |
| 1992: | February, October, |
| 1993: | February, May, September, December, |
| 1994: | March, April, October, December, |
| 1995: | February, April, June, November, |
| 1996: | January, February, March, April, May, |
| 1997: | January, February, April, May, June, October, December, |
| 1998: | February, |
| 1999: | February, |
| 2006: | March, |
| 2011: | January, |
