-95.28% is the change from 318 to 15
Calculation steps:
[( 15 - 318 ) ÷ 318] x 100 = -95.28%
Formula
Percentage change = [(15 - 318) / 318] x 100
Subtract the new number by the original number
15 - 318 = -303
-303 ÷ 318 = -0.9528301886792453
-0.9528301886792453 x 100 = -95.28%