Since the books that are published in, say, 1989 are not going to be extensively citing things that happened in 1989.
Another year-graph in Google Ngrams. Peaks come somewhat after the date, which I guess makes sense given the corpus. https://books.google.com/ngrams/graph?content=1980%2C1981%2C1982%2C1983%2C1984%2C1985%2C1986%2C1987%2C1988%2C1989&year_start=1970&year_end=2008&corpus=15&smoothing=1&share=&direct_url=t1%3B%2C1980%3B%2Cc0%3B.t1%3B%2C1981%3B%2Cc0%3B.t1%3B%2C1982%3B%2Cc0%3B.t1%3B%2C1983%3B%2Cc0%3B.t1%3B%2C1984%3B%2Cc0%3B.t1%3B%2C1985%3B%2Cc0%3B.t1%3B%2C1986%3B%2Cc0%3B.t1%3B%2C1987%3B%2Cc0%3B.t1%3B%2C1988%3B%2Cc0%3B.t1%3B%2C1989%3B%2Cc0 …pic.twitter.com/nohRyG9P5D
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On the other hand, there's something to be said about the decay curves — dwindling importance over time?
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any way to filter between books with footnotes/citations and those without?
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