-99.22% is the change from 642 to 5
Calculation steps:
[( 5 - 642 ) ÷ 642] x 100 = -99.22%
Formula
Percentage change = [(5 - 642) / 642] x 100
Subtract the new number by the original number
5 - 642 = -637
-637 ÷ 642 = -0.9922118380062306
-0.9922118380062306 x 100 = -99.22%