-4.2% is the change from 999 to 957
Calculation steps:
[( 957 - 999 ) ÷ 999] x 100 = -4.2%
Formula
Percentage change = [(957 - 999) / 999] x 100
Subtract the new number by the original number
957 - 999 = -42
-42 ÷ 999 = -0.042042042042042045
-0.042042042042042045 x 100 = -4.2%