-32.39% is the change from 318 to 215
Calculation steps:
[( 215 - 318 ) ÷ 318] x 100 = -32.39%
Formula
Percentage change = [(215 - 318) / 318] x 100
Subtract the new number by the original number
215 - 318 = -103
-103 ÷ 318 = -0.3238993710691824
-0.3238993710691824 x 100 = -32.39%