Google Books Ngram Viewer

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

1800 - 1872 1873 - 1989 1990 - 1993 1994 - 1997 1998 - 2000 concern around English
1800 - 1928 1929 - 1995 1996 - 1997 1998 - 1999 2000 concerns around English
1800 - 1928 1929 - 1984 1985 1986 - 1993 1994 - 2000 concerned around English

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