Looking for a stock with stable profit growth and a long history of boosting dividends? Just follow the quacking duck. Insurance provider Aflac (AFL) has increased its annual dividend for 30 straight years. The company recently raised its quarterly payout by 6% to 35 cents a share. Its annual dividend yield is now 2.7%, above the S&P 500 average of 2.1%. Meanwhile, the stock has risen 22% so far this year, outpacing the S&P 500's 12% gain. It's