| Covers listed |
|
| 1974: | March, April, May, June, July, August, September, October, November, December, |
| 1975: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1976: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1977: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1978: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1979: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1980: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1981: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1982: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1983: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1984: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1985: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1986: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1987: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1988: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1989: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1990: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1991: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1992: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1993: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1994: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1995: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1996: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1997: | January, February, March, April, May, June, July, August, 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, December, |
| 2002: | June, July, November, |
| 2003: | June, October, |
| 2005: | March, |
| 2006: | May, June, October, |
| 2007: | April, September, |
| 2009: | June, |
| 2010: | May, November, December, |
| 2011: | April, May, July, September, October, November, December, |
| 2012: | January, February, March, April, May, July, August, December, |
| 2013: | January, November, |
| 2014: | September, |
| 2015: | March, April, July, October, |
| 2016: | November, |
| 2017: | August, |
| 2018: | September, October, |
| 2019: | March, April, May, June, August, September, December, |
| 2020: | January, February, March, April, |
