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L.
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1983
,,.. , .. , .... ,,., , ... , .. , 1990 ""
1.5 ~ ~
1,0
I!
0.5
-
~ -
0.0
1979
1980
1981
s - - - -
200
120
:
90
f
1 6 0 r -
30 1
0
1979
1980
1981
1982
1983
1984
1985
1986
1987
1984
1989
1990
1991
120 ~ -
' 1: ~ -1- - -=!
e so
40
1992
1983
1984
1985
1986
1917
1918
1989
1990
1991
A
{)
6 0 0 0F5000
~4000
2000 -
1000 L
0
1979
191()
1981
1982
19'3
1984
1915
1911
1987
1988
1989
1990
1991
350 1
300 1
250 - -
~ 200
-
-2
~ 150 -
-'
· : :E
0
1979
-
. 1500 ~ -
-~1000
2
500
_ ,_ ,
0
1979
1980
1981
:L
25 L
60 -
50
- - - -
- - - - -N
E