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There appears to be a bug on Safari.  It appeared over the course of the last two days and results in an Invalid Date error on the chart.

Sorry to bother you!  I had things sorted as Oldest First and was reading as though it was Newest First.  Oops!

I've been relying on this tool.  At the time of this writing and for most of the day the US states are not showing.  Will this be fixed?