-21.5% is the change from 921 to 723
Calculation steps:
[( 723 - 921 ) ÷ 921] x 100 = -21.5%
Formula
Percentage change = [(723 - 921) / 921] x 100
Subtract the new number by the original number
723 - 921 = -198
-198 ÷ 921 = -0.21498371335504887
-0.21498371335504887 x 100 = -21.5%