| Covers listed | |
| 1987: | August, |
| 1994: | August, |
| 1997: | October, |
| 2000: | November, |
| 2001: | July, November, December, |
| 2004: | October, |
| 2005: | December, |
| 2010: | March, December, |
| 2011: | February, March, July, November, |
| 2012: | February, May, |
| 2013: | August, October, |
| 2014: | June, August, October, November, December, |
| 2015: | January, February, March, April, May, June, August, September, October, December, |
| 2016: | January, February, March, April, May, June, September, |
| 2017: | August, |
| 2018: | June, |
