-1.98% is the change from 656 to 643
Calculation steps:
[( 643 - 656 ) ÷ 656] x 100 = -1.98%
Formula
Percentage change = [(643 - 656) / 656] x 100
Subtract the new number by the original number
643 - 656 = -13
-13 ÷ 656 = -0.019817073170731708
-0.019817073170731708 x 100 = -1.98%