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What are “trailing 12-month total returns”?
Total Return is the percent change in value (including andy dividends) of an instrument.  The "trailing 12-month" means that your starting point is the value 12 months ago.  So the formula is: where V is the value of the instrument on the reference date, V0 is the value of the instrument 12 months prior to the reference date, and D is the amount of dividends paid between the two dates.