~
0.25
•
1
:.u;•1.w
400
350
0.20
300
~~ 250
~
0.10
0.05
1
,_
,______,______.L______9_J
~Ht
E 200
150
100
50
1
0.00
1979
1980
1981
19&2
1983
1979
1980
1981
1982
1983
19B4
1985
1986
1987
1988
1989
1990
1991
20
15
20
15
400 r
~ tO
f
1
5
_
,_
,
1
. _it. ~ -
0
1979
1980
1981
1982
~ 300 ._____ _ _ _
~
g:
200
100
300
250
3 .5
30
200
.. 2.s _ _ _
- -- • r--- - - -
l
~ 150
,
100
50
1979
1980
1981
150
120
1 _ ........ _ •
•
1 .. .._.
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
..
:l 2,0
g:
1.5
12 -
-90
:i 9
t
~
1 60
1
g: 6
» I _ .~ ..... . ... . . ~. J. -t . Lr . . ~- tt :L . ~ .. . . . .. ~
120
10
-·i·~=100
~
-
BO
-
60
4 -
- -
1.
-
' - '- '
1
,_L
' -
1
~
40
20
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
'l . 1
0
1979
1980
1981
1982
L A N G U E D 0 C
R 0 f.J
-
- -
JJI 1 Il
1983
, .... 1985 1986 ,.., 1988 1989
s s
L L
1990
1991
0 N