-4.61% is the change from 912 to 870
Calculation steps:
[( 870 - 912 ) ÷ 912] x 100 = -4.61%
Formula
Percentage change = [(870 - 912) / 912] x 100
Subtract the new number by the original number
870 - 912 = -42
-42 ÷ 912 = -0.046052631578947366
-0.046052631578947366 x 100 = -4.61%