-91.72% is the change from 870 to 72
Calculation steps:
[( 72 - 870 ) ÷ 870] x 100 = -91.72%
Formula
Percentage change = [(72 - 870) / 870] x 100
Subtract the new number by the original number
72 - 870 = -798
-798 ÷ 870 = -0.9172413793103448
-0.9172413793103448 x 100 = -91.72%