-99.08% is the change from 870 to 8
Calculation steps:
[( 8 - 870 ) ÷ 870] x 100 = -99.08%
Formula
Percentage change = [(8 - 870) / 870] x 100
Subtract the new number by the original number
8 - 870 = -862
-862 ÷ 870 = -0.9908045977011494
-0.9908045977011494 x 100 = -99.08%