19.15% is the change from 684 to 815
Calculation steps:
[( 815 - 684 ) ÷ 684] x 100 = 19.15%
Formula
Percentage change = [(815 - 684) / 684] x 100
Subtract the new number by the original number
815 - 684 = 131
131 ÷ 684 = 0.1915204678362573
0.1915204678362573 x 100 = 19.15%