-22.86% is the change from 831 to 641
Calculation steps:
[( 641 - 831 ) ÷ 831] x 100 = -22.86%
Formula
Percentage change = [(641 - 831) / 831] x 100
Subtract the new number by the original number
641 - 831 = -190
-190 ÷ 831 = -0.2286401925391095
-0.2286401925391095 x 100 = -22.86%