Google Books Ngram Viewer

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

1750 - 1876 1877 - 1968 1969 - 1979 1980 - 1990 1991 - 2000 it is raining English
1750 - 1842 1843 - 1902 1903 - 1915 1916 - 1967 1968 - 2000 rain is falling English

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