0.6 l
0.5
~
0,4
-Ji'
~ 0.3
0.2
0.1
o.o
40
.,;
"
~
Ir 20
10
0
4,0
3.5
3.0
..
4
2.0
-Ji'
~ 1,5
1.0
0.5
0.0
11
i
100
80
4
Ji'
!î
4
60 - -
Ji'
!î
80
70
60
~ 50
Ji'
!î 40
30
20
10
1979
19!0
1981
w•:n31nw
,_
-
n
- -
[
-
n
,_
-
~ iIT
- - JL ·=
1982
1983
1984
1985
1986
1987
u
-
- -
-
I l
n
-
n
1968
1989
1990
199 1
5000 --------------11---,,,--~~---tJ----~-------!4°00 r
~3000
--:fi
2000
1000
... , 1983 19&4
800
/UO
6 0 0 r-~ 500 lif 1-----=--- ll----f"l--~11
•j. 400 -
Ir
300
200
100
1979
1980
1981
1932
1913
1984
1500 l
1200
900
300
A
1985
1986
1987
....
1991
.... ....
N
E