Google Books Ngram Viewer

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

1800 - 1842 1843 - 1944 1945 - 1953 1954 - 1989 1990 - 2008 catsup English
1800 - 1805 1806 1807 - 1913 1914 - 2007 2008 catchup English
1800 - 1824 1825 - 1992 1993 - 1999 2000 - 2004 2005 - 2008 ketchup English

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