-23.31% is the change from 871 to 668
Calculation steps:
[( 668 - 871 ) ÷ 871] x 100 = -23.31%
Formula
Percentage change = [(668 - 871) / 871] x 100
Subtract the new number by the original number
668 - 871 = -203
-203 ÷ 871 = -0.2330654420206659
-0.2330654420206659 x 100 = -23.31%