-49.31% is the change from 866 to 439
Calculation steps:
[( 439 - 866 ) ÷ 866] x 100 = -49.31%
Formula
Percentage change = [(439 - 866) / 866] x 100
Subtract the new number by the original number
439 - 866 = -427
-427 ÷ 866 = -0.4930715935334873
-0.4930715935334873 x 100 = -49.31%