-64.39% is the change from 921 to 328
Calculation steps:
[( 328 - 921 ) ÷ 921] x 100 = -64.39%
Formula
Percentage change = [(328 - 921) / 921] x 100
Subtract the new number by the original number
328 - 921 = -593
-593 ÷ 921 = -0.6438653637350705
-0.6438653637350705 x 100 = -64.39%