-43.56% is the change from 870 to 491
Calculation steps:
[( 491 - 870 ) ÷ 870] x 100 = -43.56%
Formula
Percentage change = [(491 - 870) / 870] x 100
Subtract the new number by the original number
491 - 870 = -379
-379 ÷ 870 = -0.435632183908046
-0.435632183908046 x 100 = -43.56%