Interesting. Based on a tweet from @Renee_Hopkins regarding the frequency of use of "disruptive innovation", I visited the site and put in the word "collaboration". It looks like from about 1870 on there's a fairly even slope, save for the period around WWII (which, I both assumed and pretty much confirmed by checking some titles, had to do with the scrutiny of European collaboration with the Nazis - though there were some other studies as well). Also, it looks like it peaks in 2000 and is currently waning somewhat precipitously.
See this Amp at http://amplify.com/u/iocn
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