-49.6% is the change from 871 to 439
Calculation steps:
[( 439 - 871 ) ÷ 871] x 100 = -49.6%
Formula
Percentage change = [(439 - 871) / 871] x 100
Subtract the new number by the original number
439 - 871 = -432
-432 ÷ 871 = -0.49598163030998854
-0.49598163030998854 x 100 = -49.6%