| Covers listed | |
| 1975: | February, |
| 1976: | February, |
| 1977: | September, December, |
| 1978: | February, March, April, May, July, August, September, October, November, December, |
| 1979: | January, February, March, April, May, June, July, September, October, November, December, |
| 1980: | January, February, April, May, June, July, August, October, November, December, |
| 1981: | January, February, March, April, May, June, August, September, |
| 1982: | October, |
| 1983: | February, |
