21.45% is the change from 816 to 991
Calculation steps:
[( 991 - 816 ) ÷ 816] x 100 = 21.45%
Formula
Percentage change = [(991 - 816) / 816] x 100
Subtract the new number by the original number
991 - 816 = 175
175 ÷ 816 = 0.21446078431372548
0.21446078431372548 x 100 = 21.45%