-10.5% is the change from 638 to 571
Calculation steps:
[( 571 - 638 ) ÷ 638] x 100 = -10.5%
Formula
Percentage change = [(571 - 638) / 638] x 100
Subtract the new number by the original number
571 - 638 = -67
-67 ÷ 638 = -0.10501567398119123
-0.10501567398119123 x 100 = -10.5%