-30.31% is the change from 828 to 577
Calculation steps:
[( 577 - 828 ) ÷ 828] x 100 = -30.31%
Formula
Percentage change = [(577 - 828) / 828] x 100
Subtract the new number by the original number
577 - 828 = -251
-251 ÷ 828 = -0.3031400966183575
-0.3031400966183575 x 100 = -30.31%