3438.89% is the change from 18 to 637
Calculation steps:
[( 637 - 18 ) ÷ 18] x 100 = 3438.89%
Formula
Percentage change = [(637 - 18) / 18] x 100
Subtract the new number by the original number
637 - 18 = 619
619 ÷ 18 = 34.388888888888886
34.388888888888886 x 100 = 3438.89%