-6.1% is the change from 328 to 308
Calculation steps:
[( 308 - 328 ) ÷ 328] x 100 = -6.1%
Formula
Percentage change = [(308 - 328) / 328] x 100
Subtract the new number by the original number
308 - 328 = -20
-20 ÷ 328 = -0.06097560975609756
-0.06097560975609756 x 100 = -6.1%