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<br />RVERRSE YIEl1l DIFFERENTIRL <br /> <br />'CO- <br /> <br /> - <br /> - ,.- <br /> r- <br />,.- <br /> <br />260- <br /> <br />2CO- <br /> <br />u <br />~150- <br /> <br />ICO- <br /> <br />50- <br /> <br />-..] <br />~ <br /> <br />0- <br /> <br />1972 1973 1974 1975 1976 1977 <br /> <br />u <br />~l&O- <br />- <br /> <br />RVERRGE EARNINGS DRYLRND <br /> <br />500- <br /> <br /> ~ <br /> .- <br />- - - <br /> <br />250- <br /> <br />200- <br /> <br />100- <br /> <br />50- <br /> <br />0- <br /> <br />1972 1975 1974 1975 1976 1977 <br /> <br />L- <br />~I&O- <br />- <br /> <br />c <br />= <br />N <br />r,"' <br />CO~ <br />"'-' <br /> <br />ECONOMIC <br />REGION <br />7 <br /> <br />RVERAGE IRRIGATIlJl EARHIIGS <br /> <br />500- <br /> <br /> ~ <br /> ~ - <br /> - <br />- <br /> <br />2IIll- <br /> <br />200- <br /> <br />lCO- <br /> <br />50- <br /> <br />0- <br /> <br />1972 19~ 1974 1'175 1m 1'l77 <br />