Doesn't show ICO prices? Only the first price on the market after ICO, right?
The coinmarketcap just shows the history about the price chart of the coin itself. But for the more detail you can visit the announcement or ico stats already become a good place that calculated how many percent already gained from the ico price.
Yes, coinmarketcap gives an detail about the growth through respective token has made from the day of its existence. So in similar way it gives info about the current scenario with the top gainers and loses, other than that for each coin we need to go through and calculate the growth from the chart.