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数据如下,还是要靠市场自身的规律了。9 ^1 O3 X6 I: e; w
$ z( Q1 m# z, M3 @$ a8 u7 u, z
19910701 -.523 i# ~# o# g: }* B V
19920701 .25
* w& s# K% B- t4 y19930701 -.95' v2 B! }" X5 d% b: t) {7 O
19940701 -2.332 J( u, a& K" r, Z
19960701 -5.36
. g: n1 F2 P0 X+ B# `" G5 D, j. E19980701 -1.70# |+ c" D, ]7 a4 s; A# G3 V! @) O
19990701 -7.61, _ S" z' _4 x, t
20020701 -1.10
+ `3 m# y9 ~2 @7 o/ I# e9 `: f" c20030701 -.09
, ]( t# W+ h4 o# I7 R+ @20040701 3.00
& ?1 g# x& S4 W5 y: v20050701 -2.35
, N: _* F1 f& j20080701 -3.09% b8 Q$ L+ _- }3 c( T2 E; F; O# \5 w. J
20090701 1.650 R7 U) O9 \: V S" x. q
20100701 -1.02+ y3 J' K# T9 c1 X
20110701 -.10
3 ^- `& N( ^! c) L. w# E+ R7 T20130701 .81/ U* k7 \( L J! {! }
20140701 .10 |