-39.03% is the change from 866 to 528
Calculation steps:
[( 528 - 866 ) ÷ 866] x 100 = -39.03%
Formula
Percentage change = [(528 - 866) / 866] x 100
Subtract the new number by the original number
528 - 866 = -338
-338 ÷ 866 = -0.3903002309468822
-0.3903002309468822 x 100 = -39.03%