64.44% is the change from 509 to 837
Calculation steps:
[( 837 - 509 ) ÷ 509] x 100 = 64.44%
Formula
Percentage change = [(837 - 509) / 509] x 100
Subtract the new number by the original number
837 - 509 = 328
328 ÷ 509 = 0.6444007858546169
0.6444007858546169 x 100 = 64.44%