-1.4% is the change from 643 to 634
Calculation steps:
[( 634 - 643 ) ÷ 643] x 100 = -1.4%
Formula
Percentage change = [(634 - 643) / 643] x 100
Subtract the new number by the original number
634 - 643 = -9
-9 ÷ 643 = -0.013996889580093312
-0.013996889580093312 x 100 = -1.4%