Here are the numbers from the latest InsiderAdvantage (R) firm. Unfortunately, the firm hasn't published its July results, so the only trend number we have is Dean's (gleaned from their severely lacking press release).

Dean 15.6 (8.6)
Lieberman 14.6
Kerry 10.9
Gephardt 10.7
Sharpton 5.7
Graham 4.2
Edwards 4.5
Braun 1.1
Kucinich 1.1