63.77% is the change from 610 to 999
Calculation steps:
[( 999 - 610 ) ÷ 610] x 100 = 63.77%
Formula
Percentage change = [(999 - 610) / 610] x 100
Subtract the new number by the original number
999 - 610 = 389
389 ÷ 610 = 0.6377049180327868
0.6377049180327868 x 100 = 63.77%