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∆B=P YΔB:R;G:V:Y:

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B

B

r

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B

, f(0)=0, f(K)=0 K B

B 22/K

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Y

MSY (FMSY) XMSY)

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A B

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(1886-1896)1.

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18

20

0

2

4

6

8

10

12

14

1957 1962 1967 1972 1977 1982 1987 1992 1997 2002

5

21

0

100

200

300

400

500 Age 60+Age 40-59Age 25-39Age 15-24

22

2007 4 27

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2001 6 22

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(1949

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.

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11

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13

Level 1:

Level 2:

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