-7% is the change from 871 to 810
Calculation steps:
[( 810 - 871 ) ÷ 871] x 100 = -7%
Formula
Percentage change = [(810 - 871) / 871] x 100
Subtract the new number by the original number
810 - 871 = -61
-61 ÷ 871 = -0.07003444316877153
-0.07003444316877153 x 100 = -7%