66.4% is the change from 491 to 817
Calculation steps:
[( 817 - 491 ) ÷ 491] x 100 = 66.4%
Formula
Percentage change = [(817 - 491) / 491] x 100
Subtract the new number by the original number
817 - 491 = 326
326 ÷ 491 = 0.6639511201629328
0.6639511201629328 x 100 = 66.4%