Google Books Ngram Viewer

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

1800 - 1931 1932 - 1945 1946 - 1951 1952 - 1988 1989 - 2000 extrovert English
1800 - 1927 1928 - 1938 1939 - 1941 1942 - 1988 1989 - 2000 extravert English

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