69.61% is the change from 306 to 519
Calculation steps:
[( 519 - 306 ) ÷ 306] x 100 = 69.61%
Formula
Percentage change = [(519 - 306) / 306] x 100
Subtract the new number by the original number
519 - 306 = 213
213 ÷ 306 = 0.696078431372549
0.696078431372549 x 100 = 69.61%