I just found this... 60 years of newspaper advertising data.
What goes up CAN come down.
http://mjperry.blogspot.com.au/2012/02/newspaper-ad-revenues-fall-to-50-year.html
What goes up CAN come down.
http://mjperry.blogspot.com.au/2012/02/newspaper-ad-revenues-fall-to-50-year.html