Google Books Ngram Viewer

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

1700 - 1929 1930 - 1938 1939 - 1940 1941 - 1998 1999 - 2000 heaping tsp English
1700 - 1981 1982 - 1993 1994 - 1993 1994 - 1999 2000 heaped tsp English

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