-29.22% is the change from 308 to 218
Calculation steps:
[( 218 - 308 ) ÷ 308] x 100 = -29.22%
Formula
Percentage change = [(218 - 308) / 308] x 100
Subtract the new number by the original number
218 - 308 = -90
-90 ÷ 308 = -0.2922077922077922
-0.2922077922077922 x 100 = -29.22%