| Covers listed |
|
| 1971: | #1 , #2 , #3 , |
| 1972: | #4 , #5 , #6 , |
| 1973: | #7 , #8 , #9 , |
| 1974: | #10 , #11 , #12 , |
| 1975: | #13 , #14 , #15 , #16 /July, #17 /October, |
| 1976: | #18 /January, #19 /April, #20 /September, #21 , |
| 1977: | #22 /January, #23 /March, #24 /May, #25 /September, #26 /November, |
| 1978: | #27 /January, #28 /March, #29 /June, #30 /September, #31 /November, |
| 1979: | #32 /February, #33 /May, #34 /June/July, #35 /August/September, #36 /October/November, #37 /December/Jan., |
| 1980: | #38 /March, #39 /May, #40 /July, #41 /September, #42 /November, |
| 1981: | #43 /January, #44 /March, #45 /May, #46 /July, #47 /September, #48 /November, |
| 1982: | #49 /January, #50 /March, #51 /May, #52 /July, #53 /September, #54 /November, |
| 1983: | #55 /January, #56/57 /July, #58 /September, #59 /November, |
| 1984: | #60 /January, #61 /March, #62 /May, #63 /July, #64 /September, #65 /October, #66 /November, #67 /December, |
| 1985: | #68 /January, #69 /February, #70 /March, #71 /April, #72 /May, #73 /June, #74 /July, #75 /September, #76 /October, #77 /November, #78 /December, |
| 1986: | #79 /January, #80 /February, #81 /March, #82 /April, #83 /May, #84 /June, #85 /July, #86 /September, #87 /October, #88 /November, #89 /December, |
| 1987: | #90 /January, #91 /February, #92 /March, #93 /April, #94 /May, #95 /June, #96 /July, #97 /September, #98 /October, #99 /November, #100 /December, |
| 1988: | #101 /January, #102 /February, #103 /March, #104 /April, #105 /May, #106 /June, #107 /July, #108 /September, #109 /October, #110 /November, #111 /December, |
| 1989: | #112 /January, #113 /February, #114 /March, #115 /April, #116 /May, #117 /June, #118 /July, #119 /September, #120 /October, #121 /November, #122 /December, |
| 1990: | #123 /January, #124 /February, #125 /March, #126 /April, #127 /May, #128 /June, #129 /July, #130 /September, #131 /October, #132 /November, #133 /December, |
| 1991: | #134 /January, #135 /February, #136 /March, #137/138 /April/May, #139/140 /June/July, #141/142 /September/October, #143 /November, #144 /December, |
| 1992: | #145 /January, #146 /February, #147 /March, #148 /April, #149 /May, #150 /June, #151 /July, #152 /September, #153 /October, #154 /November, #155 /December, |
| 1993: | #156 /January, #157 /February, #158 /March, #159 /April, #160 /May, #161 /June, #162 /July, #163 /August/September, #164 /October, #165 /November, #166 /December, |
| 1994: | #167 /January, #168/169 /February/March, #170 /April, #171 /May, #172 /June, #173 /July, #174 /August/September, #175 /October, #176 /November, #177 /December, |
| 1995: | #178 /January, #179 /February, #180 /March, #181 /April, #182 /May, #183 /June, #184 /July, #185 /August/September, #186 /October, #187 /November, #188 /December, |
| 1996: | #189 /January, #190 /February, #191 /March, #192 /April, #193 /May, #194 /June, #195 /July, #196 /August/September, #197 /October, #198 /November, #199 /December, |
| 1997: | #200 /January, #201 /February, #202 /March, #203 /April, #204 /May, #205 /June, #206 /July, #207 /August/September, #208 /October, #209 /November, #210 /December, |
| 1998: | #211 /January, #212 /February, #213 /March, #214 /April, #215 /May, #216 /June, #217 /July, #218 /August/September, #219 /October, #220 /November, #221 /December, |
| 1999: | #222 /January, #223 /February, #224 /March, #225 /April, #226 /May, #227 /June, #228 /July, #229/230 /August/September, #231 /October, #232 /November/December, |
| 2000: | #233 /January, #234 /February, #235 /March, #236 /April, #237 /May, #238 /June, #239 /July, #240/241 /August/September, #242 /October, #243 /November, #244 /December, |
| 2001: | #245/246 /January/February, #247 /March, #248 /April, #249 /May, #250/251 /June/July, #252/253 /August/September, #254 /October, #255 /November, #256 /December, |
| 2002: | #257 /January, #258 /February, #259 /March, #260 /April, #261 /May, #262 /June, #263 /July, #264/265 /August/September, #266 /October, #267 /November, #268 /December, |
| 2003: | #269 /January, #270 /February, #271 /March, #272 /April, #273 /May, #274 /June, #275 /July, #276 /August, #277 /October, #278 /November, #279 /December, |
| 2004: | #280 /January, #281 /February, #282 /March, #283 /April, #284 /May, #285 /June, #286 /July, #287/288 /August, #289 /October, #290 /November, #291 /December, |
| 2005: | #292 /January, #293 /February, #294 /March, #295 /April, #296 /May, #297/298/299 /June, #300 /September, #301 /October, #302 /November, #303 /December, |
| 2006: | #304 /January, #305 /February, #306 /March, #307 /April, #308 /May, #309 /June, #310 /July, #311/312 /August, #313 /October, #314 /November, #315 /December, |
| 2007: | #316 /January, #317 /February, #318 /March, #319 /April, #320 /May, #321/322 /June, #323/324 /August, #325 /October, #326 /November, #327 /December, |
| 2008: | #328 /January, #329 /February, #330 /March, #331 /April, #332 /May, #333 /June, #334 /July, #335/336 /August, #337 /October, #338 /November, #339 /December, |
| 2009: | #340 /January, #341 /February, #342 /March, #343 /April, #344 /May, #345 /June, #346/347 /July, |
