22.22% is the change from 81 to 99
Calculation steps:
[( 99 - 81 ) ÷ 81] x 100 = 22.22%
Formula
Percentage change = [(99 - 81) / 81] x 100
Subtract the new number by the original number
99 - 81 = 18
18 ÷ 81 = 0.2222222222222222
0.2222222222222222 x 100 = 22.22%