-2.65% is the change from 339 to 330
Calculation steps:
[( 330 - 339 ) ÷ 339] x 100 = -2.65%
Formula
Percentage change = [(330 - 339) / 339] x 100
Subtract the new number by the original number
330 - 339 = -9
-9 ÷ 339 = -0.02654867256637168
-0.02654867256637168 x 100 = -2.65%