-51.91% is the change from 811 to 390
Calculation steps:
[( 390 - 811 ) ÷ 811] x 100 = -51.91%
Formula
Percentage change = [(390 - 811) / 811] x 100
Subtract the new number by the original number
390 - 811 = -421
-421 ÷ 811 = -0.5191122071516646
-0.5191122071516646 x 100 = -51.91%