Publishers' outsourcing of pre-press steadily growing

It would seem that magazine publishers, at least in the U.S. (and probably in Canada) are moving steadily away from doing all of their own pre-press in-house. According to Folio: magazine's 2010 manufacturing and production trends research, the number of publishers doing it all themselves was 60% last year and only 51% this year. Complete outsourcing has stayed steady at about 17% of publishers.