-2.36% is the change from 339 to 331
Calculation steps:
[( 331 - 339 ) ÷ 339] x 100 = -2.36%
Formula
Percentage change = [(331 - 339) / 339] x 100
Subtract the new number by the original number
331 - 339 = -8
-8 ÷ 339 = -0.02359882005899705
-0.02359882005899705 x 100 = -2.36%