-93.7% is the change from 238 to 15
Calculation steps:
[( 15 - 238 ) ÷ 238] x 100 = -93.7%
Formula
Percentage change = [(15 - 238) / 238] x 100
Subtract the new number by the original number
15 - 238 = -223
-223 ÷ 238 = -0.9369747899159664
-0.9369747899159664 x 100 = -93.7%