-3.1% is the change from 871 to 844
Calculation steps:
[( 844 - 871 ) ÷ 871] x 100 = -3.1%
Formula
Percentage change = [(844 - 871) / 871] x 100
Subtract the new number by the original number
844 - 871 = -27
-27 ÷ 871 = -0.030998851894374284
-0.030998851894374284 x 100 = -3.1%