Correct, it doesn't render all clicks (I dread to think how browsers would react if I tried) - all the results are put through a k-means cluster analysis at regular intervals to produce approximately 30 visible results. The percentages are calculated relative to all the clicks, though.

Nifty. So do each of the guesses shown account for a roughly equal number of clustered clicks, or do some of them aggregate more clicks than others?

I hate to throw to Wikipedia but I won't be able to do a better description than they do: https://en.wikipedia.org/wiki/K-means_clustering

No worries thanks, it's been a while since I've read the details about it.