2.56% is the change from 664 to 681
Calculation steps:
[( 681 - 664 ) ÷ 664] x 100 = 2.56%
Formula
Percentage change = [(681 - 664) / 664] x 100
Subtract the new number by the original number
681 - 664 = 17
17 ÷ 664 = 0.025602409638554216
0.025602409638554216 x 100 = 2.56%