34.58% is the change from 509 to 685
Calculation steps:
[( 685 - 509 ) ÷ 509] x 100 = 34.58%
Formula
Percentage change = [(685 - 509) / 509] x 100
Subtract the new number by the original number
685 - 509 = 176
176 ÷ 509 = 0.34577603143418467
0.34577603143418467 x 100 = 34.58%