-19.74% is the change from 390 to 313
Calculation steps:
[( 313 - 390 ) ÷ 390] x 100 = -19.74%
Formula
Percentage change = [(313 - 390) / 390] x 100
Subtract the new number by the original number
313 - 390 = -77
-77 ÷ 390 = -0.19743589743589743
-0.19743589743589743 x 100 = -19.74%