-85.74% is the change from 631 to 90
Calculation steps:
[( 90 - 631 ) ÷ 631] x 100 = -85.74%
Formula
Percentage change = [(90 - 631) / 631] x 100
Subtract the new number by the original number
90 - 631 = -541
-541 ÷ 631 = -0.8573692551505546
-0.8573692551505546 x 100 = -85.74%