| Covers listed |
|
| 1981: | May, June, November, |
| 1984: | April, |
| 1990: | January, |
| 2000: | September, |
| 2002: | April, June, August, October, December, |
| 2003: | March, May, July, September, November, |
| 2004: | May, August, October, |
| 2005: | February, June, July, September, October, |
| 2006: | February, April, July, December, |
| 2007: | July, August, October, November, |
| 2008: | February, March, May, August, October, November, December, |
| 2009: | March, August, |
| 2010: | March, September, October, |
| 2011: | February, March, May, June, August, December, |
| 2012: | February, March, May, August, September, November, |
| 2013: | January, June, July, September, November, December, |
| 2014: | January, March, May, September, |
| 2015: | January, February, May, July, November, |
| 2016: | April, May, December, |
