15.5% is the change from 858 to 991
Calculation steps:
[( 991 - 858 ) ÷ 858] x 100 = 15.5%
Formula
Percentage change = [(991 - 858) / 858] x 100
Subtract the new number by the original number
991 - 858 = 133
133 ÷ 858 = 0.155011655011655
0.155011655011655 x 100 = 15.5%