-3.9% is the change from 333 to 320
Calculation steps:
[( 320 - 333 ) ÷ 333] x 100 = -3.9%
Formula
Percentage change = [(320 - 333) / 333] x 100
Subtract the new number by the original number
320 - 333 = -13
-13 ÷ 333 = -0.03903903903903904
-0.03903903903903904 x 100 = -3.9%