-12.01% is the change from 308 to 271
Calculation steps:
[( 271 - 308 ) ÷ 308] x 100 = -12.01%
Formula
Percentage change = [(271 - 308) / 308] x 100
Subtract the new number by the original number
271 - 308 = -37
-37 ÷ 308 = -0.12012987012987013
-0.12012987012987013 x 100 = -12.01%