1990.48% is the change from 21 to 439
Calculation steps:
[( 439 - 21 ) ÷ 21] x 100 = 1990.48%
Formula
Percentage change = [(439 - 21) / 21] x 100
Subtract the new number by the original number
439 - 21 = 418
418 ÷ 21 = 19.904761904761905
19.904761904761905 x 100 = 1990.48%