| Covers listed | |
| 1998: | March, July, October, |
| 1999: | January, April, July, |
| 2000: | January, April, July, October, |
| 2001: | January, April, July, October, |
| 2002: | January, April, July, October, |
| 2003: | January, July, |
| 2004: | April, July, |
| 2005: | January, October, |
| 2007: | July, |
| 2008: | January, April, July, October, |
| 2014: | June, |
