-99.88% is the change from 866 to 1
Calculation steps:
[( 1 - 866 ) ÷ 866] x 100 = -99.88%
Formula
Percentage change = [(1 - 866) / 866] x 100
Subtract the new number by the original number
1 - 866 = -865
-865 ÷ 866 = -0.9988452655889145
-0.9988452655889145 x 100 = -99.88%