-2.82% is the change from 319 to 310
Calculation steps:
[( 310 - 319 ) ÷ 319] x 100 = -2.82%
Formula
Percentage change = [(310 - 319) / 319] x 100
Subtract the new number by the original number
310 - 319 = -9
-9 ÷ 319 = -0.02821316614420063
-0.02821316614420063 x 100 = -2.82%