-74.92% is the change from 921 to 231
Calculation steps:
[( 231 - 921 ) ÷ 921] x 100 = -74.92%
Formula
Percentage change = [(231 - 921) / 921] x 100
Subtract the new number by the original number
231 - 921 = -690
-690 ÷ 921 = -0.749185667752443
-0.749185667752443 x 100 = -74.92%