-47.12% is the change from 921 to 487
Calculation steps:
[( 487 - 921 ) ÷ 921] x 100 = -47.12%
Formula
Percentage change = [(487 - 921) / 921] x 100
Subtract the new number by the original number
487 - 921 = -434
-434 ÷ 921 = -0.47122692725298587
-0.47122692725298587 x 100 = -47.12%