-31.46% is the change from 906 to 621
Calculation steps:
[( 621 - 906 ) ÷ 906] x 100 = -31.46%
Formula
Percentage change = [(621 - 906) / 906] x 100
Subtract the new number by the original number
621 - 906 = -285
-285 ÷ 906 = -0.31456953642384106
-0.31456953642384106 x 100 = -31.46%