Is there any graph that shows how the value of token went from ico and after hitting exchanges?
Yes, there is. Just try to look at the coinmarketcap chart, and you will see the price at the ico price and after went to the exchange site. For the more information just try to visit the exchange website and take a look at his chart, The new chart of the coin usually the ico price of the coin itself.
How did price fluctuate in biggest coins?
The fluctuate within the same line with the most prominent coin.