-1.04% is the change from 670 to 663
Calculation steps:
[( 663 - 670 ) ÷ 670] x 100 = -1.04%
Formula
Percentage change = [(663 - 670) / 670] x 100
Subtract the new number by the original number
663 - 670 = -7
-7 ÷ 670 = -0.010447761194029851
-0.010447761194029851 x 100 = -1.04%