-8.4% is the change from 238 to 218
Calculation steps:
[( 218 - 238 ) ÷ 238] x 100 = -8.4%
Formula
Percentage change = [(218 - 238) / 238] x 100
Subtract the new number by the original number
218 - 238 = -20
-20 ÷ 238 = -0.08403361344537816
-0.08403361344537816 x 100 = -8.4%