-0.21% is the change from 480 to 479
Calculation steps:
[( 479 - 480 ) ÷ 480] x 100 = -0.21%
Formula
Percentage change = [(479 - 480) / 480] x 100
Subtract the new number by the original number
479 - 480 = -1
-1 ÷ 480 = -0.0020833333333333333
-0.0020833333333333333 x 100 = -0.21%