2933.33% is the change from 21 to 637
Calculation steps:
[( 637 - 21 ) ÷ 21] x 100 = 2933.33%
Formula
Percentage change = [(637 - 21) / 21] x 100
Subtract the new number by the original number
637 - 21 = 616
616 ÷ 21 = 29.333333333333332
29.333333333333332 x 100 = 2933.33%