-30.04% is the change from 912 to 638
Calculation steps:
[( 638 - 912 ) ÷ 912] x 100 = -30.04%
Formula
Percentage change = [(638 - 912) / 912] x 100
Subtract the new number by the original number
638 - 912 = -274
-274 ÷ 912 = -0.30043859649122806
-0.30043859649122806 x 100 = -30.04%