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<br />u <br />~ltID- <br />- <br /> <br />AVERAGE YIELD DIffERENTIRL <br /> <br />llOll- <br /> <br />r- <br /> - - <br /> - <br /> <br />2&0- <br /> <br />200- <br /> <br />1CO- <br /> <br />so- <br /> <br />0'> 0- <br />Co 1972 1973 1974 1975 1976 1977 <br /> <br />U <br />~1'60- <br />- <br /> <br />RVERAGE EARNINGS DRYUlNO <br /> <br />500- <br /> <br />- r- <br /> - <br /> - <br /> <br />2&0- <br /> <br />200- <br /> <br />100- <br /> <br />50- <br /> <br />0- <br /> <br />1972 1973 1974 1975 1976 1977 <br /> <br />L- <br />~160- <br />- <br /> <br />Q <br />Q <br />N <br />1-'" <br />J <br />(0 <br /> <br />ECONOMIC <br />REGION <br />5 <br /> <br />RVERAGE IRRIGRTION EARNINGS <br /> <br />500- <br /> <br />260- <br /> <br />-. <br /> r- - <br /> - <br /> <br />200- <br /> <br />100- <br /> <br />50- <br /> <br />0- <br /> <br />1972 1973 1974 1975 1976 1977 <br />