-30.32% is the change from 831 to 579
Calculation steps:
[( 579 - 831 ) ÷ 831] x 100 = -30.32%
Formula
Percentage change = [(579 - 831) / 831] x 100
Subtract the new number by the original number
579 - 831 = -252
-252 ÷ 831 = -0.30324909747292417
-0.30324909747292417 x 100 = -30.32%