Chey Cobb. figures are subjective and they change from year to year. Your best bet is to refer to reports such as the FBI/CSI survey (available at www.gocsi.com/ forms/fbi/pdf.html) to give you some indication as to the prevalence of attacks.
|Title||:||Network Security For Dummies|
|Publisher||:||John Wiley & Sons - 2011-05-09|