2.24% is the change from 671 to 686
Calculation steps:
[( 686 - 671 ) ÷ 671] x 100 = 2.24%
Formula
Percentage change = [(686 - 671) / 671] x 100
Subtract the new number by the original number
686 - 671 = 15
15 ÷ 671 = 0.022354694485842028
0.022354694485842028 x 100 = 2.24%