-0.8% is the change from 878 to 871
Calculation steps:
[( 871 - 878 ) ÷ 878] x 100 = -0.8%
Formula
Percentage change = [(871 - 878) / 878] x 100
Subtract the new number by the original number
871 - 878 = -7
-7 ÷ 878 = -0.007972665148063782
-0.007972665148063782 x 100 = -0.8%