8.47% is the change from 921 to 999
Calculation steps:
[( 999 - 921 ) ÷ 921] x 100 = 8.47%
Formula
Percentage change = [(999 - 921) / 921] x 100
Subtract the new number by the original number
999 - 921 = 78
78 ÷ 921 = 0.08469055374592833
0.08469055374592833 x 100 = 8.47%