-26.41% is the change from 871 to 641
Calculation steps:
[( 641 - 871 ) ÷ 871] x 100 = -26.41%
Formula
Percentage change = [(641 - 871) / 871] x 100
Subtract the new number by the original number
641 - 871 = -230
-230 ÷ 871 = -0.26406429391504016
-0.26406429391504016 x 100 = -26.41%