3.31% is the change from 664 to 686
Calculation steps:
[( 686 - 664 ) ÷ 664] x 100 = 3.31%
Formula
Percentage change = [(686 - 664) / 664] x 100
Subtract the new number by the original number
686 - 664 = 22
22 ÷ 664 = 0.03313253012048193
0.03313253012048193 x 100 = 3.31%