-56.86% is the change from 999 to 431
Calculation steps:
[( 431 - 999 ) ÷ 999] x 100 = -56.86%
Formula
Percentage change = [(431 - 999) / 999] x 100
Subtract the new number by the original number
431 - 999 = -568
-568 ÷ 999 = -0.5685685685685685
-0.5685685685685685 x 100 = -56.86%