-93.66% is the change from 631 to 40
Calculation steps:
[( 40 - 631 ) ÷ 631] x 100 = -93.66%
Formula
Percentage change = [(40 - 631) / 631] x 100
Subtract the new number by the original number
40 - 631 = -591
-591 ÷ 631 = -0.936608557844691
-0.936608557844691 x 100 = -93.66%