-16.86% is the change from 771 to 641
Calculation steps:
[( 641 - 771 ) ÷ 771] x 100 = -16.86%
Formula
Percentage change = [(641 - 771) / 771] x 100
Subtract the new number by the original number
641 - 771 = -130
-130 ÷ 771 = -0.16861219195849547
-0.16861219195849547 x 100 = -16.86%