-55.2% is the change from 866 to 388
Calculation steps:
[( 388 - 866 ) ÷ 866] x 100 = -55.2%
Formula
Percentage change = [(388 - 866) / 866] x 100
Subtract the new number by the original number
388 - 866 = -478
-478 ÷ 866 = -0.5519630484988453
-0.5519630484988453 x 100 = -55.2%