-6.95% is the change from 331 to 308
Calculation steps:
[( 308 - 331 ) ÷ 331] x 100 = -6.95%
Formula
Percentage change = [(308 - 331) / 331] x 100
Subtract the new number by the original number
308 - 331 = -23
-23 ÷ 331 = -0.06948640483383686
-0.06948640483383686 x 100 = -6.95%