Google Books Ngram Viewer

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

1960 - 1966 1967 - 1980 1981 - 1982 1983 - 2004 2005 - 2008 about proportion of English
1960 - 1964 1965 - 1981 1982 - 1985 1986 - 2001 2002 - 2008 about the proportion of English

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