-39.15% is the change from 871 to 530
Calculation steps:
[( 530 - 871 ) ÷ 871] x 100 = -39.15%
Formula
Percentage change = [(530 - 871) / 871] x 100
Subtract the new number by the original number
530 - 871 = -341
-341 ÷ 871 = -0.39150401836969
-0.39150401836969 x 100 = -39.15%