-30.35% is the change from 916 to 638
Calculation steps:
[( 638 - 916 ) ÷ 916] x 100 = -30.35%
Formula
Percentage change = [(638 - 916) / 916] x 100
Subtract the new number by the original number
638 - 916 = -278
-278 ÷ 916 = -0.3034934497816594
-0.3034934497816594 x 100 = -30.35%