-30.39% is the change from 928 to 646
Calculation steps:
[( 646 - 928 ) ÷ 928] x 100 = -30.39%
Formula
Percentage change = [(646 - 928) / 928] x 100
Subtract the new number by the original number
646 - 928 = -282
-282 ÷ 928 = -0.30387931034482757
-0.30387931034482757 x 100 = -30.39%