-89.51% is the change from 677 to 71
Calculation steps:
[( 71 - 677 ) ÷ 677] x 100 = -89.51%
Formula
Percentage change = [(71 - 677) / 677] x 100
Subtract the new number by the original number
71 - 677 = -606
-606 ÷ 677 = -0.8951255539143279
-0.8951255539143279 x 100 = -89.51%