3.61% is the change from 664 to 688
Calculation steps:
[( 688 - 664 ) ÷ 664] x 100 = 3.61%
Formula
Percentage change = [(688 - 664) / 664] x 100
Subtract the new number by the original number
688 - 664 = 24
24 ÷ 664 = 0.03614457831325301
0.03614457831325301 x 100 = 3.61%