1.0

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al
%
tK
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L
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m

o
0
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a)
>
.—
%
%
K

.O1 —

t

1

1
f

1970

I

1980

I

I

1

1

I

i

20’20

mlo

1990

t
I

20s
.

YEAR
Figure

12. William

–

Proiected

Exoosure

Rate

“ “~=~Redo

Select target paragraph3