-0.16% is the change from 644 to 643
Calculation steps:
[( 643 - 644 ) ÷ 644] x 100 = -0.16%
Formula
Percentage change = [(643 - 644) / 644] x 100
Subtract the new number by the original number
643 - 644 = -1
-1 ÷ 644 = -0.0015527950310559005
-0.0015527950310559005 x 100 = -0.16%