-8.5% is the change from 871 to 797
Calculation steps:
[( 797 - 871 ) ÷ 871] x 100 = -8.5%
Formula
Percentage change = [(797 - 871) / 871] x 100
Subtract the new number by the original number
797 - 871 = -74
-74 ÷ 871 = -0.08495981630309989
-0.08495981630309989 x 100 = -8.5%