Where do I get current general statistics on how many users get past homepages?

While clearly this varies from site to site, Jacob Nielson had some 2003 studies of this. In the service of highlighting poor homepage design, I’d like to be able to say “The majority of users don’t get past the homepage of a website” (or something along these lines, if it is accurate), and to quote a reputable source (from 2008/09).