-0.23% is the change from 863 to 861
Calculation steps:
[( 861 - 863 ) ÷ 863] x 100 = -0.23%
Formula
Percentage change = [(861 - 863) / 863] x 100
Subtract the new number by the original number
861 - 863 = -2
-2 ÷ 863 = -0.002317497103128621
-0.002317497103128621 x 100 = -0.23%