The first graph establishes that there is no clear trend or clustering in the data points. The second one lets you visualize just how many years are around the

The first graph establishes that there is no clear trend or clustering in the data points. The second one lets you visualize just how many years are around the 10% average or not, and then the argument is expanded from there. They seem to serve their purpose pretty well. There's probably a nicer way to display that, and maybe combine them as one of Tufte's principles would suggest, but I don't see anything that would make him weep here :) What do you have in mind?