-53.64% is the change from 921 to 427
Calculation steps:
[( 427 - 921 ) ÷ 921] x 100 = -53.64%
Formula
Percentage change = [(427 - 921) / 921] x 100
Subtract the new number by the original number
427 - 921 = -494
-494 ÷ 921 = -0.5363735070575462
-0.5363735070575462 x 100 = -53.64%