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Some related info. Here are the monthly expiration changes going back
to 1983.
(where M is the month of expiration, and W is the number of
weeks in the expiration month)
DATES M W %CHG
19820920 - 19821015 10 4 8.14
19821018 - 19821119 11 5 3.59
19821122 - 19821217 12 4 1.07
19821220 - 19830121 1 5 5.01
19830124 - 19830218 2 4 2.66
19830222 - 19830318 3 4 0.65
19830321 - 19830422 4 5 7.19
19830425 - 19830520 5 4 -0.30
19830523 - 19830617 6 4 4.66
19830620 - 19830715 7 4 -2.98
19830718 - 19830819 8 5 0.48
19830822 - 19830916 9 4 1.53
19830919 - 19831021 10 5 -0.35
19831024 - 19831118 11 4 -0.71
19831121 - 19831216 12 4 -1.26
19831219 - 19840120 1 5 1.17
19840123 - 19840217 2 4 -7.47
19840221 - 19840316 3 4 2.72
19840319 - 19840419 4 5 -0.99
19840423 - 19840518 5 4 -1.30
19840521 - 19840615 6 4 -4.65
19840618 - 19840720 7 5 1.24
19840723 - 19840817 8 4 10.67
19840820 - 19840921 9 5 0.31
19840924 - 19841019 10 4 1.04
19841022 - 19841116 11 4 -3.02
19841119 - 19841221 12 5 1.38
19841224 - 19850118 1 4 3.42
19850121 - 19850215 2 4 5.13
19850219 - 19850315 3 4 -2.42
19850318 - 19850419 4 5 1.49
19850422 - 19850517 5 4 2.93
19850520 - 19850621 6 5 0.87
19850624 - 19850719 7 4 2.83
19850722 - 19850816 8 4 -4.47
19850819 - 19850920 9 5 -1.68
19850923 - 19851018 10 4 2.81
19851021 - 19851115 11 4 5.12
19851118 - 19851220 12 5 7.50
19851223 - 19860117 1 4 -1.44
19860120 - 19860221 2 5 7.52
19860224 - 19860321 3 4 2.09
19860324 - 19860418 4 4 3.73
19860421 - 19860516 5 4 -3.59
19860519 - 19860620 6 5 6.19
19860623 - 19860718 7 4 -4.97
19860721 - 19860815 8 4 3.31
19860818 - 19860919 9 5 -4.62
19860922 - 19861017 10 4 1.83
19861020 - 19861121 11 5 3.89
19861124 - 19861219 12 4 2.07
19861222 - 19870116 1 4 6.36
19870119 - 19870220 2 5 8.43
19870223 - 19870320 3 4 4.78
19870323 - 19870416 4 4 -2.69
19870420 - 19870515 5 4 0.77
19870518 - 19870619 6 5 6.29
19870622 - 19870717 7 4 2.89
19870720 - 19870821 8 5 7.13
19870824 - 19870918 9 4 -6.88
19870921 - 19871016 10 4 -11.11
19871019 - 19871120 11 5 -13.27
19871123 - 19871218 12 4 2.10
19871221 - 19880122 1 5 -2.36
19880125 - 19880219 2 4 5.62
19880222 - 19880318 3 4 2.58
19880321 - 19880422 4 5 -3.99
19880425 - 19880520 5 4 -2.00
19880523 - 19880617 6 4 7.18
19880620 - 19880715 7 4 0.48
19880718 - 19880819 8 5 -5.57
19880822 - 19880916 9 4 4.55
19880919 - 19881021 10 5 4.37
19881024 - 19881118 11 4 -5.72
19881121 - 19881216 12 4 4.21
19881219 - 19890120 1 5 3.12
19890123 - 19890217 2 4 3.95
19890221 - 19890317 3 4 -1.55
19890320 - 19890421 4 5 5.12
19890424 - 19890519 5 4 3.01
19890522 - 19890616 6 4 -0.93
19890619 - 19890721 7 5 5.10
19890724 - 19890818 8 4 2.80
19890821 - 19890915 9 4 0.25
19890918 - 19891020 10 5 0.41
19891023 - 19891117 11 4 -1.52
19891120 - 19891215 12 4 3.04
19891218 - 19900119 1 5 -2.89
19900122 - 19900216 2 4 -2.48
19900220 - 19900316 3 4 3.61
19900319 - 19900420 4 5 -0.91
19900423 - 19900518 5 4 5.30
19900521 - 19900615 6 4 2.83
19900618 - 19900720 7 5 -0.33
19900723 - 19900817 8 4 -10.12
19900820 - 19900921 9 5 -4.38
19900924 - 19901019 10 4 1.11
19901022 - 19901116 11 4 0.79
19901119 - 19901221 12 5 3.21
19901224 - 19910118 1 4 0.91
19910121 - 19910215 2 4 11.05
19910219 - 19910315 3 4 1.74
19910318 - 19910419 4 5 2.59
19910422 - 19910517 5 4 -2.95
19910520 - 19910621 6 5 1.75
19910624 - 19910719 7 4 2.12
19910722 - 19910816 8 4 -0.93
19910819 - 19910920 9 5 -0.06
19910923 - 19911018 10 4 1.32
19911021 - 19911115 11 4 -3.74
19911118 - 19911220 12 5 1.98
19911223 - 19920117 1 4 8.33
19920120 - 19920221 2 5 -1.78
19920224 - 19920320 3 4 -0.43
19920323 - 19920416 4 4 1.78
19920420 - 19920515 5 4 -1.17
19920518 - 19920619 6 5 -0.91
19920622 - 19920717 7 4 1.26
19920720 - 19920821 8 5 -0.90
19920824 - 19920918 9 4 2.10
19920921 - 19921016 10 4 -3.81
19921019 - 19921120 11 5 3.09
19921123 - 19921218 12 4 3.69
19921221 - 19930122 1 5 -1.65
19930125 - 19930219 2 4 0.87
19930222 - 19930319 3 4 3.91
19930322 - 19930416 4 4 0.06
19930419 - 19930521 5 5 -0.86
19930524 - 19930618 6 4 0.10
19930621 - 19930716 7 4 -0.06
19930719 - 19930820 8 5 2.42
19930823 - 19930917 9 4 0.39
19930920 - 19931015 10 4 1.19
19931018 - 19931119 11 5 -0.06
19931122 - 19931217 12 4 0.68
19931220 - 19940121 1 5 2.04
19940124 - 19940218 2 4 -1.10
19940222 - 19940318 3 4 0.09
19940321 - 19940422 4 5 -5.49
19940425 - 19940520 5 4 2.69
19940523 - 19940617 6 4 0.15
19940620 - 19940715 7 4 -0.56
19940718 - 19940819 8 5 1.66
19940822 - 19940916 9 4 2.22
19940919 - 19941021 10 5 -1.66
19941024 - 19941118 11 4 -0.04
19941121 - 19941216 12 4 -0.29
19941219 - 19950120 1 5 0.43
19950123 - 19950217 2 4 4.00
19950221 - 19950317 3 4 3.62
19950320 - 19950421 4 5 3.76
19950424 - 19950519 5 4 2.28
19950522 - 19950616 6 4 4.45
19950619 - 19950721 7 5 2.76
19950724 - 19950818 8 4 -0.30
19950821 - 19950915 9 4 4.88
19950918 - 19951020 10 5 1.35
19951023 - 19951117 11 4 2.28
19951120 - 19951215 12 4 2.88
19951218 - 19960119 1 5 -1.05
19960122 - 19960216 2 4 6.19
19960220 - 19960315 3 4 0.04
19960318 - 19960419 4 5 0.26
19960422 - 19960517 5 4 3.71
19960520 - 19960621 6 5 0.11
19960624 - 19960719 7 4 -4.56
19960722 - 19960816 8 4 4.50
19960819 - 19960920 9 5 3.24
19960923 - 19961018 10 4 3.70
19961021 - 19961115 11 4 3.27
19961118 - 19961220 12 5 2.28
19961223 - 19970117 1 4 4.57
19970120 - 19970221 2 5 2.47
19970224 - 19970321 3 4 -2.28
19970324 - 19970418 4 4 -2.14
19970421 - 19970516 5 4 8.80
19970519 - 19970620 6 5 7.87
19970623 - 19970718 7 4 2.21
19970721 - 19970815 8 4 -2.96
19970818 - 19970919 9 5 5.42
19970922 - 19971017 10 4 -1.26
19971020 - 19971121 11 5 2.44
19971124 - 19971219 12 4 -2.80
19971222 - 19980116 1 4 1.23
19980120 - 19980220 2 5 8.47
19980223 - 19980320 3 4 6.17
19980323 - 19980417 4 4 3.36
19980420 - 19980515 5 4 -0.81
19980518 - 19980619 6 5 -0.55
19980622 - 19980717 7 4 8.56
19980720 - 19980821 8 5 -8.11
19980824 - 19980918 9 4 -7.29
19980921 - 19981016 10 4 5.19
19981019 - 19981120 11 5 10.37
19981123 - 19981218 12 4 2.59
19981221 - 19990122 1 5 3.48
19990125 - 19990219 2 4 1.62
19990222 - 19990319 3 4 4.81
19990322 - 19990416 4 4 2.85
19990419 - 19990521 5 5 0.47
19990524 - 19990618 6 4 1.74
19990621 - 19990716 7 4 7.36
19990719 - 19990820 8 5 -5.07
19990823 - 19990917 9 4 1.20
19990920 - 19991015 10 4 -7.55
19991018 - 19991119 11 5 14.97
19991122 - 19991217 12 4 3.29
19991220 - 20000121 1 5 0.76
20000124 - 20000218 2 4 -6.57
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