163.11% is the change from 309 to 813
Calculation steps:
[( 813 - 309 ) ÷ 309] x 100 = 163.11%
Formula
Percentage change = [(813 - 309) / 309] x 100
Subtract the new number by the original number
813 - 309 = 504
504 ÷ 309 = 1.6310679611650485
1.6310679611650485 x 100 = 163.11%