-83.22% is the change from 870 to 146
Calculation steps:
[( 146 - 870 ) ÷ 870] x 100 = -83.22%
Formula
Percentage change = [(146 - 870) / 870] x 100
Subtract the new number by the original number
146 - 870 = -724
-724 ÷ 870 = -0.832183908045977
-0.832183908045977 x 100 = -83.22%