31.83% is the change from 509 to 671
Calculation steps:
[( 671 - 509 ) ÷ 509] x 100 = 31.83%
Formula
Percentage change = [(671 - 509) / 509] x 100
Subtract the new number by the original number
671 - 509 = 162
162 ÷ 509 = 0.3182711198428291
0.3182711198428291 x 100 = 31.83%