63800% is the change from 1 to 639
Calculation steps:
[( 639 - 1 ) ÷ 1] x 100 = 63800%
Formula
Percentage change = [(639 - 1) / 1] x 100
Subtract the new number by the original number
639 - 1 = 638
638 ÷ 1 = 638
638 x 100 = 63800%
Example