7% is the change from 643 to 688
Calculation steps:
[( 688 - 643 ) ÷ 643] x 100 = 7%
Formula
Percentage change = [(688 - 643) / 643] x 100
Subtract the new number by the original number
688 - 643 = 45
45 ÷ 643 = 0.06998444790046657
0.06998444790046657 x 100 = 7%