-54.62% is the change from 866 to 393
Calculation steps:
[( 393 - 866 ) ÷ 866] x 100 = -54.62%
Formula
Percentage change = [(393 - 866) / 866] x 100
Subtract the new number by the original number
393 - 866 = -473
-473 ÷ 866 = -0.546189376443418
-0.546189376443418 x 100 = -54.62%