Google Books Ngram Viewer

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

1800 - 1804 1805 - 1812 1813 - 1894 1895 - 1988 1989 - 2000 happenning English
1800 - 1827 1828 - 1971 1972 - 1982 1983 - 1991 1992 - 2000 happening English

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