-50.52% is the change from 871 to 431
Calculation steps:
[( 431 - 871 ) ÷ 871] x 100 = -50.52%
Formula
Percentage change = [(431 - 871) / 871] x 100
Subtract the new number by the original number
431 - 871 = -440
-440 ÷ 871 = -0.505166475315729
-0.505166475315729 x 100 = -50.52%