-1.23% is the change from 649 to 641
Calculation steps:
[( 641 - 649 ) ÷ 649] x 100 = -1.23%
Formula
Percentage change = [(641 - 649) / 649] x 100
Subtract the new number by the original number
641 - 649 = -8
-8 ÷ 649 = -0.012326656394453005
-0.012326656394453005 x 100 = -1.23%