A while ago I stole a chart from the planning chief at Grey, John Lowery, and posted it. Well John can’t have been too miffed as he has updated it for the 2006 data and sent it over. If you work in advertising (like me) the message is blatantly clear.
I should probably say that this is data from the very wonderful TGI and they will probably ask me to take it down. But maybe if they realise that this is as blatant an attribution as I can create and you are all potentially extremely valuable clients for them they will be nice and give me an opensource break.