Spellometer

We all know certain spelling errors are very common, such as miniscule or geneology. But how common exactly, and are they getting more or less common as time goes on?

The google web API can help us here. I've written a program which measures the frequency of several common errors every day. The plots show the frequency of each misspelling, relative to the total number of occurrences (correct + incorrect) of the word in question. Gaps indicate missing data.