Everyone who bought in with BTC and/or FIAT paid ~0.1331 USD per ICN. So we have to consider THIS number and not the average number to calculate the % of ICN value fluctuation.
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You calculate it the way you choose with whatever subset of currencies you want.  I'll use the official ICONOMI total amount raised number and stick with 0.1257 USD per ICN as the official ICO final price.