30.61% is the change from 624 to 815
Calculation steps:
[( 815 - 624 ) ÷ 624] x 100 = 30.61%
Formula
Percentage change = [(815 - 624) / 624] x 100
Subtract the new number by the original number
815 - 624 = 191
191 ÷ 624 = 0.3060897435897436
0.3060897435897436 x 100 = 30.61%