Investing isn't easy. Even Warren Buffett counsels that most investors should invest in a low-cost index like the S&P 500. That way, "you'll be buying into a wonderful industry, which in effect is all of American industry," he says.

But there are, of course, companies whose long-term fortunes differ substantially from the index. In this series, we look at how individual stocks have performed against the broad S&P 500.

Step on up, Hershey (NYSE: HSY).                                                      

Hershey shares have easily outperformed the S&P 500 over the last quarter-century, with most of the outperformance occurring in the last few years:

Hsysp

Source: S&P Capital IQ.

Since 1987, shares have returned an average of 12.5% a year, compared with 9.7% a year for the S&P (both include dividends). That difference adds up fast. One thousand dollars invested in the S&P in 1987 would be worth $19,200 today. In Hershey, it'd be worth $42,100.          

Dividends accounted for a lot of those gains. Compounded since 1987, dividends have made up about 50% of Hershey's total returns. For the S&P, dividends account for 39% of total returns.

Now have a look at how Hershey earnings compare with S&P 500 earnings:

Hsyearnings

Source: S&P Capital IQ.

Decent outperformance here, too. Since 1995, Hershey earnings per share have increased by an average of 7.5% a year, compared with 6% a year for the broader index.

What's that meant for valuations? Hershey has traded for an average of 22 times earnings since 1987 -- just below the 24 times earnings of the broader S&P 500.

Through it all, shares have been strong performers over the last quarter-century.  

Of course, the important question is whether that will continue. That's where you come in. Our CAPS community currently ranks Hershey with a three-star rating (out of five). Care to disagree? Leave your thoughts in the comment section below, or add Hershey to My Watchlist.