-50% is the change from 866 to 433
Calculation steps:
[( 433 - 866 ) ÷ 866] x 100 = -50%
Formula
Percentage change = [(433 - 866) / 866] x 100
Subtract the new number by the original number
433 - 866 = -433
-433 ÷ 866 = -0.5
-0.5 x 100 = -50%
Example