| Covers listed | |
| 1967: | April, June, August, October, December, |
| 1968: | February, April, June, August, October, December, |
| 1969: | February, April, June, August, October, December, |
| 1970: | April, |
| 1971: | August, |
| 1972: | February, September, |
| 1973: | May, September, December, |
| 1974: | March, July, October, |
| 1975: | January, June, July, September, November, |
| 1976: | February, April, May, June, August, October, December, Special , |
