-95.65% is the change from 643 to 28
Calculation steps:
[( 28 - 643 ) ÷ 643] x 100 = -95.65%
Formula
Percentage change = [(28 - 643) / 643] x 100
Subtract the new number by the original number
28 - 643 = -615
-615 ÷ 643 = -0.9564541213063764
-0.9564541213063764 x 100 = -95.65%