-6.31% is the change from 871 to 816
Calculation steps:
[( 816 - 871 ) ÷ 871] x 100 = -6.31%
Formula
Percentage change = [(816 - 871) / 871] x 100
Subtract the new number by the original number
816 - 871 = -55
-55 ÷ 871 = -0.06314580941446613
-0.06314580941446613 x 100 = -6.31%