-17.83% is the change from 387 to 318
Calculation steps:
[( 318 - 387 ) ÷ 387] x 100 = -17.83%
Formula
Percentage change = [(318 - 387) / 387] x 100
Subtract the new number by the original number
318 - 387 = -69
-69 ÷ 387 = -0.17829457364341086
-0.17829457364341086 x 100 = -17.83%