-30.42% is the change from 457 to 318
Calculation steps:
[( 318 - 457 ) ÷ 457] x 100 = -30.42%
Formula
Percentage change = [(318 - 457) / 457] x 100
Subtract the new number by the original number
318 - 457 = -139
-139 ÷ 457 = -0.3041575492341357
-0.3041575492341357 x 100 = -30.42%