Google Books Ngram Viewer

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

1900 - 1981 1982 - 2004 2005 - 2006 2007 - 2008 2009 - 2008 smiley English
1900 - 1951 1952 - 1991 1992 1993 - 2005 2006 - 2008 smilie English

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