-0.36% is the change from 843 to 840
Calculation steps:
[( 840 - 843 ) ÷ 843] x 100 = -0.36%
Formula
Percentage change = [(840 - 843) / 843] x 100
Subtract the new number by the original number
840 - 843 = -3
-3 ÷ 843 = -0.0035587188612099642
-0.0035587188612099642 x 100 = -0.36%