...increased the company's quarterly common stock dividend to 21.75 cents per share, for an annualized dividend of 87 cents per share. This is the 31st consecutive year that MDU Resources has increased its common stock dividend. The previous quarterly dividend was 21.25 cents per share. MDU Resources for 84 years has paid uninterrupted dividends to shareholders. Of the U.S.-listed, dividend-paying companies, fewer than 82 have increased their stock dividend as many consecutive years as MDU Resources. "We remain committed to paying dividends to our shareholders as part of the total value they receive from their investment in MDU Resources," said Dennis W. Johnson, chair of the board. "We also are proud of our long tradition of annually increasing those dividends." MDU Resources is listed on the S