1.0
0,8
ci.
-jf 0.6
r
0,4
0.2
0,0
'
1979
1980
1981
1982
1983
1984
1 ...
1986
1987
IH8
1989
1990
1991
8
fr'•-'" "li
1
-
"1 1 l t E .
1
' ·n ltt
1
t-._j
1979
1980
1981
1982
1'83
1984
1985
1986
1987
1 . . .
1 ...
1990
1991
d
:~
~
1 r~
r
,_
lk__J_ ""0
1019
Hl80
1981
1982
1983
1984
198S
1986
1987
1988
80
11
70
60
"'
50
"
jf
40
g:
30
20
10
•• •• 2 • . . . . . . __.
,, .. 1985 1986 1987 1988 1989 1990 1991
40
35
30 -
"'
25
"
~
11 lu__,
1981
1982
1"3
1 ...
1985
1986
1911!17
1 ...
1989
1990
1991
jf 20
g:
15
10
0
50
40
,,;
" 30
jf
g:
I~
15183
1 ...
1985
1986
1987
1989
1990
1991
r.J
0
R
M
200
_,,,,_
150
1 r
if
11
·- ,_
,,
~
~ I
~ ' l
- - ..._,_
1
-La._
L..__,
50
1979
1980
1981
1982
1913
1984
1985
1986
1'i87
1988
1i89
1990
1991
12
t - -
I l ~
L ~ i - L ...._ ~·
L _ _I
: : ~f f i g_' -
1 ...
~ -1985 1986 · =-- . . . ' , _ [l]'
jf
g:
1.0
0,5
'
1
1
L. L _ _
M1: 1:t3:M
-
1
1
_,_ ,
1
. _ l 1u 11. l 1l .
0 ,0
1979
1980
1981
1982
1983
1984
1gss
1986
1947
Hl88
1i89
1990
1991
15 1
12
g rci.
jf
g:
3 t
.
LL
, _ ,
- ·-0
1179
1900
191•
1985
1986
1 . . 7
1 ...
1990
1991
12
10
:l"
,;
d
-jf
r
Ll.
4 ~
2 l
1 _ _ , _ _ 1
1 _ _ , _ _
0
1979
1980
1981
1983
1984
1985
1986
1987
19 . .
1989
1 ...
1991
A
N
0
E