TC, to clarify what I did a bit more, the duplicates I found were in the *data downloads*, and once I had resolved those inconsistencies and felt I had a "clean" data base all the way back to 1/2/86, I linked the Nasi sheet Adv Dec values to the new data. That's when the returns jumped, so I can only assume that some of the new values were different from those that were originally in the Nasi sheet. It would simply not have been workable to go through each entry and change or verify it manually. However, prior to the linking, I made sure there was a one-to-one correspondence with the data ranges, so I am fairly confident that the new data is more correct, to the extent of the reliability of the unicorn site. I would welcome and encourage anyone to duplicate my findings independently.