-1.03% is the change from 875 to 866
Calculation steps:
[( 866 - 875 ) ÷ 875] x 100 = -1.03%
Formula
Percentage change = [(866 - 875) / 875] x 100
Subtract the new number by the original number
866 - 875 = -9
-9 ÷ 875 = -0.010285714285714285
-0.010285714285714285 x 100 = -1.03%