-53.48% is the change from 690 to 321
Calculation steps:
[( 321 - 690 ) ÷ 690] x 100 = -53.48%
Formula
Percentage change = [(321 - 690) / 690] x 100
Subtract the new number by the original number
321 - 690 = -369
-369 ÷ 690 = -0.5347826086956522
-0.5347826086956522 x 100 = -53.48%