Google Books Ngram Viewer

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

1800 - 1834 1835 - 1911 1912 - 1924 1925 - 1975 1976 - 2000 reason that English
1800 - 1823 1824 - 1916 1917 - 1933 1934 - 1971 1972 - 2000 reason why English

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