-3.08% is the change from 878 to 851
Calculation steps:
[( 851 - 878 ) ÷ 878] x 100 = -3.08%
Formula
Percentage change = [(851 - 878) / 878] x 100
Subtract the new number by the original number
851 - 878 = -27
-27 ÷ 878 = -0.030751708428246014
-0.030751708428246014 x 100 = -3.08%