-3.99% is the change from 878 to 843
Calculation steps:
[( 843 - 878 ) ÷ 878] x 100 = -3.99%
Formula
Percentage change = [(843 - 878) / 878] x 100
Subtract the new number by the original number
843 - 878 = -35
-35 ÷ 878 = -0.03986332574031891
-0.03986332574031891 x 100 = -3.99%