-50.16% is the change from 921 to 459
Calculation steps:
[( 459 - 921 ) ÷ 921] x 100 = -50.16%
Formula
Percentage change = [(459 - 921) / 921] x 100
Subtract the new number by the original number
459 - 921 = -462
-462 ÷ 921 = -0.501628664495114
-0.501628664495114 x 100 = -50.16%