0.61% is the change from 660 to 664
Calculation steps:
[( 664 - 660 ) ÷ 660] x 100 = 0.61%
Formula
Percentage change = [(664 - 660) / 660] x 100
Subtract the new number by the original number
664 - 660 = 4
4 ÷ 660 = 0.006060606060606061
0.006060606060606061 x 100 = 0.61%