51.04% is the change from 337 to 509
Calculation steps:
[( 509 - 337 ) ÷ 337] x 100 = 51.04%
Formula
Percentage change = [(509 - 337) / 337] x 100
Subtract the new number by the original number
509 - 337 = 172
172 ÷ 337 = 0.5103857566765578
0.5103857566765578 x 100 = 51.04%