-80.72% is the change from 669 to 129
Calculation steps:
[( 129 - 669 ) ÷ 669] x 100 = -80.72%
Formula
Percentage change = [(129 - 669) / 669] x 100
Subtract the new number by the original number
129 - 669 = -540
-540 ÷ 669 = -0.8071748878923767
-0.8071748878923767 x 100 = -80.72%