-0.91% is the change from 331 to 328
Calculation steps:
[( 328 - 331 ) ÷ 331] x 100 = -0.91%
Formula
Percentage change = [(328 - 331) / 331] x 100
Subtract the new number by the original number
328 - 331 = -3
-3 ÷ 331 = -0.00906344410876133
-0.00906344410876133 x 100 = -0.91%