-21.35% is the change from 871 to 685
Calculation steps:
[( 685 - 871 ) ÷ 871] x 100 = -21.35%
Formula
Percentage change = [(685 - 871) / 871] x 100
Subtract the new number by the original number
685 - 871 = -186
-186 ÷ 871 = -0.21354764638346727
-0.21354764638346727 x 100 = -21.35%