-32.57% is the change from 921 to 621
Calculation steps:
[( 621 - 921 ) ÷ 921] x 100 = -32.57%
Formula
Percentage change = [(621 - 921) / 921] x 100
Subtract the new number by the original number
621 - 921 = -300
-300 ÷ 921 = -0.3257328990228013
-0.3257328990228013 x 100 = -32.57%