-79.56% is the change from 631 to 129
Calculation steps:
[( 129 - 631 ) ÷ 631] x 100 = -79.56%
Formula
Percentage change = [(129 - 631) / 631] x 100
Subtract the new number by the original number
129 - 631 = -502
-502 ÷ 631 = -0.7955625990491284
-0.7955625990491284 x 100 = -79.56%