-38.8% is the change from 866 to 530
Calculation steps:
[( 530 - 866 ) ÷ 866] x 100 = -38.8%
Formula
Percentage change = [(530 - 866) / 866] x 100
Subtract the new number by the original number
530 - 866 = -336
-336 ÷ 866 = -0.38799076212471134
-0.38799076212471134 x 100 = -38.8%