39.73% is the change from 219 to 306
Calculation steps:
[( 306 - 219 ) ÷ 219] x 100 = 39.73%
Formula
Percentage change = [(306 - 219) / 219] x 100
Subtract the new number by the original number
306 - 219 = 87
87 ÷ 219 = 0.3972602739726027
0.3972602739726027 x 100 = 39.73%