-40.39% is the change from 921 to 549
Calculation steps:
[( 549 - 921 ) ÷ 921] x 100 = -40.39%
Formula
Percentage change = [(549 - 921) / 921] x 100
Subtract the new number by the original number
549 - 921 = -372
-372 ÷ 921 = -0.40390879478827363
-0.40390879478827363 x 100 = -40.39%