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I cant figure out the equation, i need to get answers to graph.

Between 1981 and 1991, water use in Canada increased for some purposes and decreased for others. The following table provides a summary.

Water consumption(millions of m cubed)
category of use 1981 1986 1991

agriculture 3 125 3 559 3 991
mining 648 593 363
manufacturing 9 937 7 984 7 282
thermal power 19 281 25 364 28 357
municipal 4 263 4 717 5 102
other 3 892 4 279 5 367
total 41 146 46 496 50 462

How do i use linear models to predict water consumption in 1999, by category and total??

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