60.9% is the change from 509 to 819
Calculation steps:
[( 819 - 509 ) ÷ 509] x 100 = 60.9%
Formula
Percentage change = [(819 - 509) / 509] x 100
Subtract the new number by the original number
819 - 509 = 310
310 ÷ 509 = 0.6090373280943026
0.6090373280943026 x 100 = 60.9%