2.63% is the change from 646 to 663
Calculation steps:
[( 663 - 646 ) ÷ 646] x 100 = 2.63%
Formula
Percentage change = [(663 - 646) / 646] x 100
Subtract the new number by the original number
663 - 646 = 17
17 ÷ 646 = 0.02631578947368421
0.02631578947368421 x 100 = 2.63%