Google Books Ngram Viewer

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

1800 - 1825 1826 - 1839 1840 - 1890 1891 - 1987 1988 - 2008 certain de ce que French
1800 - 1818 1819 - 1894 1895 - 1912 1913 - 1973 1974 - 2008 certain que French

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