[Air-L] Stats on growth of web content by year?

Dear AIR friends, It seems obvious that given the global spread of internet connections and UGC capabilities, there would be an observable growth in total content on the web over the years. Does anyone know where I can find numbers on this, especially over the last 15 years in the period often dubbed web 2.0 after the mass accessibility of blogging platforms, and social media in many places in the world, say 2000-present? Thanks.Jayson HarsinThe American University of Paris