-0.75% is the change from 669 to 664
Calculation steps:
[( 664 - 669 ) ÷ 669] x 100 = -0.75%
Formula
Percentage change = [(664 - 669) / 669] x 100
Subtract the new number by the original number
664 - 669 = -5
-5 ÷ 669 = -0.007473841554559043
-0.007473841554559043 x 100 = -0.75%