-1.1% is the change from 637 to 630
Calculation steps:
[( 630 - 637 ) ÷ 637] x 100 = -1.1%
Formula
Percentage change = [(630 - 637) / 637] x 100
Subtract the new number by the original number
630 - 637 = -7
-7 ÷ 637 = -0.01098901098901099
-0.01098901098901099 x 100 = -1.1%