My instinctive response to that chart was "YOU LIE!" I suspect the data is either based on a skewed sample, an incredibly broad definition of ESP, or simply wrong.
I expect the true number to be far higher than I'd like to believe, but 55% just doesn't make sense.
I expect the true number to be far higher than I'd like to believe
You'd like to be true, not you'd like to believe (I do so hope).
Ben Goertzel has a rather long psi-related article in Humanity Plus Magazine, apparently prompted by the recent precognition study to be published in Journal of Personality and Social Psychology. He's arguing that psi is real and we should expect to see the results of this study replicated.