Some of the days, such as
ND instead of a price. I assume that this means "No Data", but it's not explained anywhere.
Why would some days not have this data? And it's quite a few days, too, if you scroll down the huge table.
If I'm using this to look up how much money was worth for a certain date, should I instead pick the next or previous day? Or maybe some sort of average calculation based on nearby days?
Primarily, I'm asking why some days lack this data to begin with.