Google Books Ngram Viewer

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

1700 - 1813 1814 - 1987 1988 - 1996 1997 - 2003 2004 - 2018 clé French
1700 - 1749 1750 - 1865 1866 - 1889 1890 - 1978 1979 - 2018 clef French

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