DoS: Internet Security Threat Report, Volume IX Highlights
April 19, 2006Over the last six months of 2005, Symantec detected an average of 1,402 Denial of Service (DoS) attacks per day. This is an increase of 51 percent from the first half of 2005, when Symantec detected an average of 927 DoS attacks per day.
Source: http://www.symantec.com/