-0.34% is the change from 873 to 870
Calculation steps:
[( 870 - 873 ) ÷ 873] x 100 = -0.34%
Formula
Percentage change = [(870 - 873) / 873] x 100
Subtract the new number by the original number
870 - 873 = -3
-3 ÷ 873 = -0.003436426116838488
-0.003436426116838488 x 100 = -0.34%