81.97% is the change from 549 to 999
Calculation steps:
[( 999 - 549 ) ÷ 549] x 100 = 81.97%
Formula
Percentage change = [(999 - 549) / 549] x 100
Subtract the new number by the original number
999 - 549 = 450
450 ÷ 549 = 0.819672131147541
0.819672131147541 x 100 = 81.97%