0.40
ll!!l!lgrm;r. 1 ~ 14
, 1 '9l"a,fi~-------12000
lj&t3!.!
0.35
0.30
.
-~ 0.25
i 0,20 --~ - - -- -
~ 90
"" E Go ~
30
0
1979
1980
1981
1985
1986
1987
1988
1989
1990
1991
-
40
"
30 -
~
10000
~6000
.~
0
1979
4000
2000
1960
1981
2000 r
1500
1000
800
_"600 t""
g:
: =t -
0
1979
1980
1981
a. HCH
~ 3
1982
1983
19S4
1985
1986
1987
1988
1989
1990
1991
1982
1983
19S4
1985
1986
1987
1988
1989
1990
1991
""
g:
20
10
~L. • l~ ~ ..... ,.., . . .
1990
1991
100
80
100
""
':l . , 1 l~ l JLJLILILIL_ ~- . IL .
0
1979
1<}80
1981
1982
1983
198'1
1985
1900
1987
1988
1989
1990
1991
Q
u
25
-"='':
20 -
-
-
- - - -- - -
-
~ 15 .
"" g:1 0 -
-
.. t
0
1979
1980
1981
1982
1983
1984
8 ~.U:Z·mlH -
7 '
5 -
~
"" 4
-
- -
'' . 1 _ . l
0
1979
1960
1981
1982
1983
1984
T
A
1985
1986
1987
1985
1986
N
1991
1988
1989
1990
199 1
E