-31.45% is the change from 318 to 218
Calculation steps:
[( 218 - 318 ) ÷ 318] x 100 = -31.45%
Formula
Percentage change = [(218 - 318) / 318] x 100
Subtract the new number by the original number
218 - 318 = -100
-100 ÷ 318 = -0.31446540880503143
-0.31446540880503143 x 100 = -31.45%