Is there a graphic or dataset way to campare the performance of the main currencies over the years?
I mean a graph that allows to compare many currencies on the same chart, and not two currencies at time
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As @keshlam mentioned, OANDA and many other websites offer daily histories of exchange rates for download. I recommend downloading the history of each exchange rate you care about versus a common currency (such as USD). Then use your favorite data analysis tool (R, Excel, ...) to plot them all on the same graph with date on the X axis and value-in-USD on the Y axis. (You might want to scale some of them first; KRW and JPY, for example, are worth so little in USD that you won't even be able to see their movements.)
MyCurrencyTransfer offers really good historical currency information over a 12 month period, broken down by over 160 cross currency pairings.