21.3% is the change from 817 to 991
Calculation steps:
[( 991 - 817 ) ÷ 817] x 100 = 21.3%
Formula
Percentage change = [(991 - 817) / 817] x 100
Subtract the new number by the original number
991 - 817 = 174
174 ÷ 817 = 0.21297429620563035
0.21297429620563035 x 100 = 21.3%