-6.66% is the change from 871 to 813
Calculation steps:
[( 813 - 871 ) ÷ 871] x 100 = -6.66%
Formula
Percentage change = [(813 - 871) / 871] x 100
Subtract the new number by the original number
813 - 871 = -58
-58 ÷ 871 = -0.06659012629161883
-0.06659012629161883 x 100 = -6.66%