-30.95% is the change from 924 to 638
Calculation steps:
[( 638 - 924 ) ÷ 924] x 100 = -30.95%
Formula
Percentage change = [(638 - 924) / 924] x 100
Subtract the new number by the original number
638 - 924 = -286
-286 ÷ 924 = -0.30952380952380953
-0.30952380952380953 x 100 = -30.95%