-53.62% is the change from 690 to 320
Calculation steps:
[( 320 - 690 ) ÷ 690] x 100 = -53.62%
Formula
Percentage change = [(320 - 690) / 690] x 100
Subtract the new number by the original number
320 - 690 = -370
-370 ÷ 690 = -0.5362318840579711
-0.5362318840579711 x 100 = -53.62%