-44.41% is the change from 921 to 512
Calculation steps:
[( 512 - 921 ) ÷ 921] x 100 = -44.41%
Formula
Percentage change = [(512 - 921) / 921] x 100
Subtract the new number by the original number
512 - 921 = -409
-409 ÷ 921 = -0.44408251900108575
-0.44408251900108575 x 100 = -44.41%