-88.04% is the change from 669 to 80
Calculation steps:
[( 80 - 669 ) ÷ 669] x 100 = -88.04%
Formula
Percentage change = [(80 - 669) / 669] x 100
Subtract the new number by the original number
80 - 669 = -589
-589 ÷ 669 = -0.8804185351270553
-0.8804185351270553 x 100 = -88.04%