-39.15% is the change from 866 to 527
Calculation steps:
[( 527 - 866 ) ÷ 866] x 100 = -39.15%
Formula
Percentage change = [(527 - 866) / 866] x 100
Subtract the new number by the original number
527 - 866 = -339
-339 ÷ 866 = -0.39145496535796764
-0.39145496535796764 x 100 = -39.15%