-37.28% is the change from 507 to 318
Calculation steps:
[( 318 - 507 ) ÷ 507] x 100 = -37.28%
Formula
Percentage change = [(318 - 507) / 507] x 100
Subtract the new number by the original number
318 - 507 = -189
-189 ÷ 507 = -0.3727810650887574
-0.3727810650887574 x 100 = -37.28%