99.68% is the change from 309 to 617
Calculation steps:
[( 617 - 309 ) ÷ 309] x 100 = 99.68%
Formula
Percentage change = [(617 - 309) / 309] x 100
Subtract the new number by the original number
617 - 309 = 308
308 ÷ 309 = 0.9967637540453075
0.9967637540453075 x 100 = 99.68%