-0.92% is the change from 866 to 858
Calculation steps:
[( 858 - 866 ) ÷ 866] x 100 = -0.92%
Formula
Percentage change = [(858 - 866) / 866] x 100
Subtract the new number by the original number
858 - 866 = -8
-8 ÷ 866 = -0.009237875288683603
-0.009237875288683603 x 100 = -0.92%