56.58% is the change from 638 to 999
Calculation steps:
[( 999 - 638 ) ÷ 638] x 100 = 56.58%
Formula
Percentage change = [(999 - 638) / 638] x 100
Subtract the new number by the original number
999 - 638 = 361
361 ÷ 638 = 0.5658307210031348
0.5658307210031348 x 100 = 56.58%