-28.7% is the change from 871 to 621
Calculation steps:
[( 621 - 871 ) ÷ 871] x 100 = -28.7%
Formula
Percentage change = [(621 - 871) / 871] x 100
Subtract the new number by the original number
621 - 871 = -250
-250 ÷ 871 = -0.2870264064293915
-0.2870264064293915 x 100 = -28.7%