-94.1% is the change from 390 to 23
Calculation steps:
[( 23 - 390 ) ÷ 390] x 100 = -94.1%
Formula
Percentage change = [(23 - 390) / 390] x 100
Subtract the new number by the original number
23 - 390 = -367
-367 ÷ 390 = -0.941025641025641
-0.941025641025641 x 100 = -94.1%