-2.09% is the change from 861 to 843
Calculation steps:
[( 843 - 861 ) ÷ 861] x 100 = -2.09%
Formula
Percentage change = [(843 - 861) / 861] x 100
Subtract the new number by the original number
843 - 861 = -18
-18 ÷ 861 = -0.020905923344947737
-0.020905923344947737 x 100 = -2.09%