-99.19% is the change from 866 to 7
Calculation steps:
[( 7 - 866 ) ÷ 866] x 100 = -99.19%
Formula
Percentage change = [(7 - 866) / 866] x 100
Subtract the new number by the original number
7 - 866 = -859
-859 ÷ 866 = -0.9919168591224018
-0.9919168591224018 x 100 = -99.19%