-0.34% is the change from 870 to 867
Calculation steps:
[( 867 - 870 ) ÷ 870] x 100 = -0.34%
Formula
Percentage change = [(867 - 870) / 870] x 100
Subtract the new number by the original number
867 - 870 = -3
-3 ÷ 870 = -0.0034482758620689655
-0.0034482758620689655 x 100 = -0.34%