-26.37% is the change from 531 to 391
Calculation steps:
[( 391 - 531 ) ÷ 531] x 100 = -26.37%
Formula
Percentage change = [(391 - 531) / 531] x 100
Subtract the new number by the original number
391 - 531 = -140
-140 ÷ 531 = -0.263653483992467
-0.263653483992467 x 100 = -26.37%