-1.94% is the change from 878 to 861
Calculation steps:
[( 861 - 878 ) ÷ 878] x 100 = -1.94%
Formula
Percentage change = [(861 - 878) / 878] x 100
Subtract the new number by the original number
861 - 878 = -17
-17 ÷ 878 = -0.0193621867881549
-0.0193621867881549 x 100 = -1.94%