Google Books Ngram Viewer

Graph these comma-separated phrases:
case-insensitive
between and from the corpus with smoothing of .  
Search in Google Books:

1800 - 1870 1871 - 1926 1927 - 1938 1939 - 1989 1990 - 2000 unbeknown English
1800 - 1892 1893 - 1984 1985 - 1991 1992 - 1996 1997 - 2000 unbeknownst English

Run your own experiment! Raw data is available for download here.
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