-81.29% is the change from 684 to 128
Calculation steps:
[( 128 - 684 ) ÷ 684] x 100 = -81.29%
Formula
Percentage change = [(128 - 684) / 684] x 100
Subtract the new number by the original number
128 - 684 = -556
-556 ÷ 684 = -0.8128654970760234
-0.8128654970760234 x 100 = -81.29%