-88.07% is the change from 679 to 81
Calculation steps:
[( 81 - 679 ) ÷ 679] x 100 = -88.07%
Formula
Percentage change = [(81 - 679) / 679] x 100
Subtract the new number by the original number
81 - 679 = -598
-598 ÷ 679 = -0.8807069219440353
-0.8807069219440353 x 100 = -88.07%