-29.5% is the change from 905 to 638
Calculation steps:
[( 638 - 905 ) ÷ 905] x 100 = -29.5%
Formula
Percentage change = [(638 - 905) / 905] x 100
Subtract the new number by the original number
638 - 905 = -267
-267 ÷ 905 = -0.2950276243093923
-0.2950276243093923 x 100 = -29.5%