-15.69% is the change from 816 to 688
Calculation steps:
[( 688 - 816 ) ÷ 816] x 100 = -15.69%
Formula
Percentage change = [(688 - 816) / 816] x 100
Subtract the new number by the original number
688 - 816 = -128
-128 ÷ 816 = -0.1568627450980392
-0.1568627450980392 x 100 = -15.69%