-54.04% is the change from 866 to 398
Calculation steps:
[( 398 - 866 ) ÷ 866] x 100 = -54.04%
Formula
Percentage change = [(398 - 866) / 866] x 100
Subtract the new number by the original number
398 - 866 = -468
-468 ÷ 866 = -0.5404157043879908
-0.5404157043879908 x 100 = -54.04%