-89.39% is the change from 669 to 71
Calculation steps:
[( 71 - 669 ) ÷ 669] x 100 = -89.39%
Formula
Percentage change = [(71 - 669) / 669] x 100
Subtract the new number by the original number
71 - 669 = -598
-598 ÷ 669 = -0.8938714499252616
-0.8938714499252616 x 100 = -89.39%