-31% is the change from 871 to 601
Calculation steps:
[( 601 - 871 ) ÷ 871] x 100 = -31%
Formula
Percentage change = [(601 - 871) / 871] x 100
Subtract the new number by the original number
601 - 871 = -270
-270 ÷ 871 = -0.3099885189437428
-0.3099885189437428 x 100 = -31%