206.73% is the change from 208 to 638
Calculation steps:
[( 638 - 208 ) ÷ 208] x 100 = 206.73%
Formula
Percentage change = [(638 - 208) / 208] x 100
Subtract the new number by the original number
638 - 208 = 430
430 ÷ 208 = 2.0673076923076925
2.0673076923076925 x 100 = 206.73%