3.17% is the change from 663 to 684
Calculation steps:
[( 684 - 663 ) ÷ 663] x 100 = 3.17%
Formula
Percentage change = [(684 - 663) / 663] x 100
Subtract the new number by the original number
684 - 663 = 21
21 ÷ 663 = 0.03167420814479638
0.03167420814479638 x 100 = 3.17%