Google Books Ngram Viewer

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

1900 - 1920 1921 - 1960 1961 - 1966 1967 - 1990 1991 - 2000 is the denominator of English
1900 - 1926 1927 - 1977 1978 - 1984 1985 - 1992 1993 - 2000 common denominator English

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