-30.11% is the change from 455 to 318
Calculation steps:
[( 318 - 455 ) ÷ 455] x 100 = -30.11%
Formula
Percentage change = [(318 - 455) / 455] x 100
Subtract the new number by the original number
318 - 455 = -137
-137 ÷ 455 = -0.3010989010989011
-0.3010989010989011 x 100 = -30.11%