-44.63% is the change from 921 to 510
Calculation steps:
[( 510 - 921 ) ÷ 921] x 100 = -44.63%
Formula
Percentage change = [(510 - 921) / 921] x 100
Subtract the new number by the original number
510 - 921 = -411
-411 ÷ 921 = -0.44625407166123776
-0.44625407166123776 x 100 = -44.63%