Google Books Ngram Viewer

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

1800 - 1912 1913 - 1938 1939 - 1945 1946 - 1995 1996 - 2000 headed in the right direction English
1800 - 1928 1929 - 1990 1991 - 1994 1995 - 1998 1999 - 2000 heading in the right direction English

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