-99.54% is the change from 866 to 4
Calculation steps:
[( 4 - 866 ) ÷ 866] x 100 = -99.54%
Formula
Percentage change = [(4 - 866) / 866] x 100
Subtract the new number by the original number
4 - 866 = -862
-862 ÷ 866 = -0.9953810623556582
-0.9953810623556582 x 100 = -99.54%