-35.1% is the change from 490 to 318
Calculation steps:
[( 318 - 490 ) ÷ 490] x 100 = -35.1%
Formula
Percentage change = [(318 - 490) / 490] x 100
Subtract the new number by the original number
318 - 490 = -172
-172 ÷ 490 = -0.3510204081632653
-0.3510204081632653 x 100 = -35.1%