3.24% is the change from 649 to 670
Calculation steps:
[( 670 - 649 ) ÷ 649] x 100 = 3.24%
Formula
Percentage change = [(670 - 649) / 649] x 100
Subtract the new number by the original number
670 - 649 = 21
21 ÷ 649 = 0.032357473035439135
0.032357473035439135 x 100 = 3.24%