-99.31% is the change from 870 to 6
Calculation steps:
[( 6 - 870 ) ÷ 870] x 100 = -99.31%
Formula
Percentage change = [(6 - 870) / 870] x 100
Subtract the new number by the original number
6 - 870 = -864
-864 ÷ 870 = -0.993103448275862
-0.993103448275862 x 100 = -99.31%