-49.48% is the change from 871 to 440
Calculation steps:
[( 440 - 871 ) ÷ 871] x 100 = -49.48%
Formula
Percentage change = [(440 - 871) / 871] x 100
Subtract the new number by the original number
440 - 871 = -431
-431 ÷ 871 = -0.49483352468427094
-0.49483352468427094 x 100 = -49.48%