-55.31% is the change from 866 to 387
Calculation steps:
[( 387 - 866 ) ÷ 866] x 100 = -55.31%
Formula
Percentage change = [(387 - 866) / 866] x 100
Subtract the new number by the original number
387 - 866 = -479
-479 ÷ 866 = -0.5531177829099307
-0.5531177829099307 x 100 = -55.31%