-37.15% is the change from 506 to 318
Calculation steps:
[( 318 - 506 ) ÷ 506] x 100 = -37.15%
Formula
Percentage change = [(318 - 506) / 506] x 100
Subtract the new number by the original number
318 - 506 = -188
-188 ÷ 506 = -0.3715415019762846
-0.3715415019762846 x 100 = -37.15%