Google Books Ngram Viewer

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

1960 - 1963 1964 - 1980 1981 - 1983 1984 - 2001 2002 - 2008 the group surveyed English
1960 - 1968 1969 - 1990 1991 - 1994 1995 - 2004 2005 - 2008 the surveyed group English

Excluding ngrams with part-of-speech tags from search links.

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