it was a big refactor of the source code in the src/ directory in October 2011, that's the big drop in average curl tool source file size. We cleaned up and improved the situation.
you might want to add an axis on the left with file count, that will explain the split files in 2012 quite well; a "total linecount" would also be interesting in that same graph but then you do not have enough axis unless you double them up ;)
Tom Hayward
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