2.25% is the change from 666 to 681
Calculation steps:
[( 681 - 666 ) ÷ 666] x 100 = 2.25%
Formula
Percentage change = [(681 - 666) / 666] x 100
Subtract the new number by the original number
681 - 666 = 15
15 ÷ 666 = 0.02252252252252252
0.02252252252252252 x 100 = 2.25%