-66.41% is the change from 390 to 131
Calculation steps:
[( 131 - 390 ) ÷ 390] x 100 = -66.41%
Formula
Percentage change = [(131 - 390) / 390] x 100
Subtract the new number by the original number
131 - 390 = -259
-259 ÷ 390 = -0.6641025641025641
-0.6641025641025641 x 100 = -66.41%