3.11% is the change from 643 to 663
Calculation steps:
[( 663 - 643 ) ÷ 643] x 100 = 3.11%
Formula
Percentage change = [(663 - 643) / 643] x 100
Subtract the new number by the original number
663 - 643 = 20
20 ÷ 643 = 0.03110419906687403
0.03110419906687403 x 100 = 3.11%