61.13% is the change from 620 to 999
Calculation steps:
[( 999 - 620 ) ÷ 620] x 100 = 61.13%
Formula
Percentage change = [(999 - 620) / 620] x 100
Subtract the new number by the original number
999 - 620 = 379
379 ÷ 620 = 0.6112903225806452
0.6112903225806452 x 100 = 61.13%