In 2004 an average of 2,500 Web servers were hacked daily

In 2004 an average of 2,500 Web servers were hacked daily > Security > IT Facts

As a sign of the growing threat that the Internet faces, the number of sites that were hacked into rose by over 400,000 compared to 2003 figures. That is certainly a lot of sites. IT Facts has some additional impressive statistics you should look at.