63.14% is the change from 312 to 509
Calculation steps:
[( 509 - 312 ) ÷ 312] x 100 = 63.14%
Formula
Percentage change = [(509 - 312) / 312] x 100
Subtract the new number by the original number
509 - 312 = 197
197 ÷ 312 = 0.6314102564102564
0.6314102564102564 x 100 = 63.14%