-25.75% is the change from 866 to 643
Calculation steps:
[( 643 - 866 ) ÷ 866] x 100 = -25.75%
Formula
Percentage change = [(643 - 866) / 866] x 100
Subtract the new number by the original number
643 - 866 = -223
-223 ÷ 866 = -0.2575057736720554
-0.2575057736720554 x 100 = -25.75%