6.44% is the change from 621 to 661
Calculation steps:
[( 661 - 621 ) ÷ 621] x 100 = 6.44%
Formula
Percentage change = [(661 - 621) / 621] x 100
Subtract the new number by the original number
661 - 621 = 40
40 ÷ 621 = 0.0644122383252818
0.0644122383252818 x 100 = 6.44%