I ended up using Wikipedia and Excel as a quick-and-dirty approach. Unfortunately, the Wikipedia table has a lot of extraneous annotations, so after copying it

I ended up using Wikipedia and Excel as a quick-and-dirty approach. Unfortunately, the Wikipedia table has a lot of extraneous annotations, so after copying it into my spreadsheet, I had to do some filtering and manual data munging to get it into a usable format. I then created a PivotTable to do the calculations.