The Yahoo charts are just price charts - ie: what people were trading shares for that day, adjusted for splits. The total return also includes the dividends, but that isn't reflected in the graph (aside from the small blue D icons at the bottom). On Yahoo you can look at the Adjusted Close price by clicking on Historical Prices, since the Adj. Close reflects dividends & splits. I don't know why they don't have a way to graph things based on Adj. Close though - Portfolio Visualizer definitely helps get a more accurate picture of things IMHO.
The returns on PAMCX do look quite nice, though who knows if they will continue to outperform in the future. Also just a heads up that they seem to frequently have short-term capital gains distributions, by looking at the "Dividend and Capital Gains Distributions" on Morningstar. That shouldn't matter in a tax-advantaged account, but in a taxable account it would more negatively impact your returns, depending on your specific tax situation.