-18.21% is the change from 390 to 319
Calculation steps:
[( 319 - 390 ) ÷ 390] x 100 = -18.21%
Formula
Percentage change = [(319 - 390) / 390] x 100
Subtract the new number by the original number
319 - 390 = -71
-71 ÷ 390 = -0.18205128205128204
-0.18205128205128204 x 100 = -18.21%