-30.26% is the change from 456 to 318
Calculation steps:
[( 318 - 456 ) ÷ 456] x 100 = -30.26%
Formula
Percentage change = [(318 - 456) / 456] x 100
Subtract the new number by the original number
318 - 456 = -138
-138 ÷ 456 = -0.3026315789473684
-0.3026315789473684 x 100 = -30.26%