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<br />'00- <br /> <br />RVERAGE YIELD DIFFERENTIRL <br /> <br />0- <br /> <br />- <br /> - r- <br /> r- <br /> <br />250- <br /> <br />200- <br /> <br />u <br />~160- <br /> <br />100- <br /> <br />so- <br /> <br />00 <br />"'" <br /> <br />1972 1973 1974 1975 1976 1977 <br /> <br />u <br />~160- <br />- <br /> <br />RVERAGE EARNINGS DRYl.RNll <br /> <br />500- <br /> <br />r- <br /> r- <br /> - <br /> - <br /> <br />250- <br /> <br />200- <br /> <br />100- <br /> <br />50- <br /> <br />0- <br /> <br />1972 1973 1974 1975 1976 1977 <br /> <br />L- <br />~1&0- <br />- <br /> <br />Q <br /><:> <br />N <br />"-, <br />.-"n <br />:.0 <br /> <br />ECONOMIC <br />REGION <br />10 <br /> <br />RVERAGE IRRIGRTION EARNINGS <br /> <br />500- <br /> <br />50- <br /> <br />.- <br /> r- r- <br /> r- <br /> <br />260- <br /> <br />200- <br /> <br />100- <br /> <br />0- <br /> <br />1972 1975 1974 1975 1976 1977 <br />