You can check the current going prices on that mmobucks site, the current going price for isk appears to be ~$9 / 400m, which is less than the lowest price in the graph that covered the last few years, though it seems the price has been flat for a few months.



The big spikes in the market appear to coincide with expansions, chinese new year, and the big spike in 2009 seems to be when someone robbed a bank. Yep. There was a bank. And someone walked away with it. And then the CCP banned a bunch of farmers so people lost all their money and supplies were low.