-52.33% is the change from 921 to 439
Calculation steps:
[( 439 - 921 ) ÷ 921] x 100 = -52.33%
Formula
Percentage change = [(439 - 921) / 921] x 100
Subtract the new number by the original number
439 - 921 = -482
-482 ÷ 921 = -0.5233441910966341
-0.5233441910966341 x 100 = -52.33%