-30.9% is the change from 835 to 577
Calculation steps:
[( 577 - 835 ) ÷ 835] x 100 = -30.9%
Formula
Percentage change = [(577 - 835) / 835] x 100
Subtract the new number by the original number
577 - 835 = -258
-258 ÷ 835 = -0.3089820359281437
-0.3089820359281437 x 100 = -30.9%