100 f- 



1962 1963 1964 1965 1956 1967 1968 1969 1970 1971 1972 

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80 - 



« 60 - 

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1 40 



-^ 20 



a> 



6 







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o 



> 



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-60 



1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 

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