-54.07% is the change from 921 to 423
Calculation steps:
[( 423 - 921 ) ÷ 921] x 100 = -54.07%
Formula
Percentage change = [(423 - 921) / 921] x 100
Subtract the new number by the original number
423 - 921 = -498
-498 ÷ 921 = -0.5407166123778502
-0.5407166123778502 x 100 = -54.07%