-38.91% is the change from 866 to 529
Calculation steps:
[( 529 - 866 ) ÷ 866] x 100 = -38.91%
Formula
Percentage change = [(529 - 866) / 866] x 100
Subtract the new number by the original number
529 - 866 = -337
-337 ÷ 866 = -0.3891454965357968
-0.3891454965357968 x 100 = -38.91%