3.18% is the change from 628 to 648
Calculation steps:
[( 648 - 628 ) ÷ 628] x 100 = 3.18%
Formula
Percentage change = [(648 - 628) / 628] x 100
Subtract the new number by the original number
648 - 628 = 20
20 ÷ 628 = 0.03184713375796178
0.03184713375796178 x 100 = 3.18%