-21.13% is the change from 871 to 687
Calculation steps:
[( 687 - 871 ) ÷ 871] x 100 = -21.13%
Formula
Percentage change = [(687 - 871) / 871] x 100
Subtract the new number by the original number
687 - 871 = -184
-184 ÷ 871 = -0.21125143513203215
-0.21125143513203215 x 100 = -21.13%