377.99% is the change from 209 to 999
Calculation steps:
[( 999 - 209 ) ÷ 209] x 100 = 377.99%
Formula
Percentage change = [(999 - 209) / 209] x 100
Subtract the new number by the original number
999 - 209 = 790
790 ÷ 209 = 3.7799043062200957
3.7799043062200957 x 100 = 377.99%