BISMARCK, N.D. (AP) — The state Tax Department says the number of North Dakotans reporting income of more than $1 million went up 7.5 percent last year.

The agency says 1,120 North Dakota taxpayers reported adjusted gross income of more than $1 million in 2014, compared with 1,041 North Dakotans in that category in 2013.

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The number of North Dakotans reporting seven-figure incomes has more than doubled since 2010. The Tax Department says the increase is largely due to payments to mineral owners by oil companies.

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Figures released to The Associated Press show the average adjusted gross income in the state increased from $71,538 in 2013 to a record $73,359 last year.

The number of returns rose from 466,256 in 2013 to 486,311 last year.

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