-31.81% is the change from 921 to 628
Calculation steps:
[( 628 - 921 ) ÷ 921] x 100 = -31.81%
Formula
Percentage change = [(628 - 921) / 921] x 100
Subtract the new number by the original number
628 - 921 = -293
-293 ÷ 921 = -0.31813246471226925
-0.31813246471226925 x 100 = -31.81%