-2.02% is the change from 643 to 630
Calculation steps:
[( 630 - 643 ) ÷ 643] x 100 = -2.02%
Formula
Percentage change = [(630 - 643) / 643] x 100
Subtract the new number by the original number
630 - 643 = -13
-13 ÷ 643 = -0.02021772939346812
-0.02021772939346812 x 100 = -2.02%