-67.13% is the change from 870 to 286
Calculation steps:
[( 286 - 870 ) ÷ 870] x 100 = -67.13%
Formula
Percentage change = [(286 - 870) / 870] x 100
Subtract the new number by the original number
286 - 870 = -584
-584 ÷ 870 = -0.671264367816092
-0.671264367816092 x 100 = -67.13%