-23.23% is the change from 835 to 641
Calculation steps:
[( 641 - 835 ) ÷ 835] x 100 = -23.23%
Formula
Percentage change = [(641 - 835) / 835] x 100
Subtract the new number by the original number
641 - 835 = -194
-194 ÷ 835 = -0.23233532934131737
-0.23233532934131737 x 100 = -23.23%