-42.9% is the change from 930 to 531
Calculation steps:
[( 531 - 930 ) ÷ 930] x 100 = -42.9%
Formula
Percentage change = [(531 - 930) / 930] x 100
Subtract the new number by the original number
531 - 930 = -399
-399 ÷ 930 = -0.4290322580645161
-0.4290322580645161 x 100 = -42.9%