-99.66% is the change from 870 to 3
Calculation steps:
[( 3 - 870 ) ÷ 870] x 100 = -99.66%
Formula
Percentage change = [(3 - 870) / 870] x 100
Subtract the new number by the original number
3 - 870 = -867
-867 ÷ 870 = -0.996551724137931
-0.996551724137931 x 100 = -99.66%