81.31% is the change from 551 to 999
Calculation steps:
[( 999 - 551 ) ÷ 551] x 100 = 81.31%
Formula
Percentage change = [(999 - 551) / 551] x 100
Subtract the new number by the original number
999 - 551 = 448
448 ÷ 551 = 0.8130671506352087
0.8130671506352087 x 100 = 81.31%