-2.28% is the change from 878 to 858
Calculation steps:
[( 858 - 878 ) ÷ 878] x 100 = -2.28%
Formula
Percentage change = [(858 - 878) / 878] x 100
Subtract the new number by the original number
858 - 878 = -20
-20 ÷ 878 = -0.022779043280182234
-0.022779043280182234 x 100 = -2.28%