-18.78% is the change from 921 to 748
Calculation steps:
[( 748 - 921 ) ÷ 921] x 100 = -18.78%
Formula
Percentage change = [(748 - 921) / 921] x 100
Subtract the new number by the original number
748 - 921 = -173
-173 ÷ 921 = -0.18783930510314875
-0.18783930510314875 x 100 = -18.78%