-51.03% is the change from 921 to 451
Calculation steps:
[( 451 - 921 ) ÷ 921] x 100 = -51.03%
Formula
Percentage change = [(451 - 921) / 921] x 100
Subtract the new number by the original number
451 - 921 = -470
-470 ÷ 921 = -0.510314875135722
-0.510314875135722 x 100 = -51.03%