3.4% is the change from 648 to 670
Calculation steps:
[( 670 - 648 ) ÷ 648] x 100 = 3.4%
Formula
Percentage change = [(670 - 648) / 648] x 100
Subtract the new number by the original number
670 - 648 = 22
22 ÷ 648 = 0.033950617283950615
0.033950617283950615 x 100 = 3.4%