-54.18% is the change from 921 to 422
Calculation steps:
[( 422 - 921 ) ÷ 921] x 100 = -54.18%
Formula
Percentage change = [(422 - 921) / 921] x 100
Subtract the new number by the original number
422 - 921 = -499
-499 ÷ 921 = -0.5418023887079262
-0.5418023887079262 x 100 = -54.18%