How much information?, a project done at the University of California at Berkeley by Peter Lyman and Hal R. Varian in 2000, attempted to measure the amount of information produced in the world each year.
"Heavy information overload: the world’s total yearly production of print, film, optical, and magnetic content would require roughly 1.5 billion gigabytes of storage. This is the equivalent of 250 megabytes per person for each man, woman, and child on earth.”
“Printed documents of all kinds comprise only .003% of the total. Magnetic storage is by far the largest medium for storing information and is the most rapidly growing, with shipped hard drive capacity doubling every year. Magnetic storage is rapidly becoming the universal medium for information storage.”
“Approximately 240 terabytes (compressed) of unique data are recorded on printed media worldwide each year.” The website provides a chart breaking down the printed media into categories.