-4.42% is the change from 906 to 866
Calculation steps:
[( 866 - 906 ) ÷ 906] x 100 = -4.42%
Formula
Percentage change = [(866 - 906) / 906] x 100
Subtract the new number by the original number
866 - 906 = -40
-40 ÷ 906 = -0.04415011037527594
-0.04415011037527594 x 100 = -4.42%