-21.47% is the change from 871 to 684
Calculation steps:
[( 684 - 871 ) ÷ 871] x 100 = -21.47%
Formula
Percentage change = [(684 - 871) / 871] x 100
Subtract the new number by the original number
684 - 871 = -187
-187 ÷ 871 = -0.21469575200918484
-0.21469575200918484 x 100 = -21.47%