-31.69% is the change from 934 to 638
Calculation steps:
[( 638 - 934 ) ÷ 934] x 100 = -31.69%
Formula
Percentage change = [(638 - 934) / 934] x 100
Subtract the new number by the original number
638 - 934 = -296
-296 ÷ 934 = -0.3169164882226981
-0.3169164882226981 x 100 = -31.69%