The graph shows changes in the global production of farmed fish and beef cattle since 1950. In 2012, some scientists predicted that the global production of farmed fish in 2020 would be six times greater than the global production of farmed fish in 1990. What was the scientist's prediction for the global production of farmed fish in 2020?

80 million tonnes

82 million tonnes

84 million tonnes

86 million tonnes

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