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数据如下，还是要靠市场自身的规律了。# | n- o, `% V/ H/ w+ B1 J
$ \; o* I6 w+ l
19910701 -.52
5 ?9 `/ e3 m! h9 V: S/ f+ P+ ~5 E19920701 .250 n6 M$ x2 B" Q0 x7 y, K& v
19930701 -.95) F9 d& d0 X4 A: I
19940701 -2.33
% @ x/ A; D! m& E1 b3 R19960701 -5.36
' Z) X2 b& d9 ]19980701 -1.70
. i" a4 S$ b1 }% D19990701 -7.611 B; l: P& f' \/ Z
20020701 -1.10
h. P6 K7 Z4 A( ]4 b0 K# t20030701 -.09! X, w, P; l) m* q& X
20040701 3.00
: |5 r' A& e; R2 N2 j+ k0 i: k20050701 -2.35
U ]5 m f/ `- I20080701 -3.09 [1 @, ~0 x9 I, \9 q
20090701 1.65! h' |' S! l6 j, q
20100701 -1.02
$ R! Y- C- u8 v& R20110701 -.105 v7 q" p; N7 l2 q4 U
20130701 .81* b% @; F, ^+ A) ~$ v4 `8 l
20140701 .10 | 
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发表于 2019-5-21 23:12:38