| Covers listed | |
| 1988: | October/December, |
| 1990: | November, |
| 1991: | February, May, August, September, October, November, December, |
| 1992: | March, April, September, October/November, December, Annual , |
| 1993: | March, April, May/July, |
| 2001: | October/December, |
| 2002: | October/December, |
