-34.53% is the change from 811 to 531
Calculation steps:
[( 531 - 811 ) ÷ 811] x 100 = -34.53%
Formula
Percentage change = [(531 - 811) / 811] x 100
Subtract the new number by the original number
531 - 811 = -280
-280 ÷ 811 = -0.34525277435265106
-0.34525277435265106 x 100 = -34.53%