-8.2% is the change from 878 to 806
Calculation steps:
[( 806 - 878 ) ÷ 878] x 100 = -8.2%
Formula
Percentage change = [(806 - 878) / 878] x 100
Subtract the new number by the original number
806 - 878 = -72
-72 ÷ 878 = -0.08200455580865604
-0.08200455580865604 x 100 = -8.2%