166.99% is the change from 306 to 817
Calculation steps:
[( 817 - 306 ) ÷ 306] x 100 = 166.99%
Formula
Percentage change = [(817 - 306) / 306] x 100
Subtract the new number by the original number
817 - 306 = 511
511 ÷ 306 = 1.6699346405228759
1.6699346405228759 x 100 = 166.99%