-57.16% is the change from 999 to 428
Calculation steps:
[( 428 - 999 ) ÷ 999] x 100 = -57.16%
Formula
Percentage change = [(428 - 999) / 999] x 100
Subtract the new number by the original number
428 - 999 = -571
-571 ÷ 999 = -0.5715715715715716
-0.5715715715715716 x 100 = -57.16%