15.15% is the change from 594 to 684
Calculation steps:
[( 684 - 594 ) ÷ 594] x 100 = 15.15%
Formula
Percentage change = [(684 - 594) / 594] x 100
Subtract the new number by the original number
684 - 594 = 90
90 ÷ 594 = 0.15151515151515152
0.15151515151515152 x 100 = 15.15%