-30.28% is the change from 928 to 647
Calculation steps:
[( 647 - 928 ) ÷ 928] x 100 = -30.28%
Formula
Percentage change = [(647 - 928) / 928] x 100
Subtract the new number by the original number
647 - 928 = -281
-281 ÷ 928 = -0.30280172413793105
-0.30280172413793105 x 100 = -30.28%