-37.4% is the change from 508 to 318
Calculation steps:
[( 318 - 508 ) ÷ 508] x 100 = -37.4%
Formula
Percentage change = [(318 - 508) / 508] x 100
Subtract the new number by the original number
318 - 508 = -190
-190 ÷ 508 = -0.37401574803149606
-0.37401574803149606 x 100 = -37.4%