This company has long been a dividend powerhouse.There are lots of reasons to like PepsiCo (PEP 0.77%) as a possible investment for your long-term portfolio. One of the best reasons is its generous dividend yield -- recently at 4.1%. That yield is far above the S&P 500's recent yield of just 1.2%, and better still, it's a payout that's been growing at a good clip -- an annual average of more than 7% over the past decade.But wait -- there's more! Its payout ratio -- the percentage of earnings paid out in div ...